Histología Transcripciones
2013
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TEJIDOS BÁSICOS Epitelio: formado principalmente por células (F.I.Keratinas) derivado del ectodermo y el endodermo, 1. excepto los endotelios (vasos sanguíneos) que derivan del mesodermo. 2. Tejio conecti!o: Elemento predominante en la matriz extracelular (F.I.imentinas). !erivado del mesodermo, encargado fundamentalmente de formar elementos distintos distin tos y las c"psulas de los #rganos. $os %uesos y los cartílagos son de te&ido conectivo. ('icroglías derivan del t. conectivo). 3. Tejio ner!ioso: onstituido por células principalmente que est"n conectadas eléctricamente (F.I. eurofilamentos y *roteína +cídica lial (células gliales- c%a/n, oligodendrocitos, astrocitos). !erivado del ectodermo (neuroectodermo da origen a la médula espinal y crestas neurales). ". Tejio #$sc$lar: Elemento principal células con capacidad contr"ctil (F.I. !esminas). !erivan del mesodermo ('. cardiaco, liso). 0ada uno de estos te&idos fa1rica un tipo de Filamento Intermedio, éstos son constituyentes del citoesqueleto.
Tejios EPITELIOS I. C%&%CTE&'STIC%S – $"minas de células estrec%amente asociadas entre sí eparan am1ientes de composici#n distinta (E&.- epidermis, epitelio intestinal separa el lumen, los – alvéolos separan la sangre del aire, etc.). – Escaso material intercelular entre las células (gases, nutrientes y líquidos muy escasos). – +sociaci#n celular mediante comple&os de uni#n (uni#n célula2 célula) y de ancla&e (uni#n célula2 matriz), permite al epitelio tener polaridad. 3rigen principalmente ectodérmico y endodérmico. – l"ndulas, %ígado, p"ncreas son de origen epitelial. – II. C(%SI)IC%CI*+ E,ITE(IOS DE &E-ESTIIE+TO: 1. Epitelio si#ple plano o #onoestrati/icao: Formado por una sola capa celular y las capas son planas. E&emplo- alvéolos, mesotelio. 2. Epitelio si#ple cico: 4na sola capa celular. E&emplo- tu1os renales, conductos de gl"ndulas. (+1sor1ente0) 3. Epitelio si#ple cilínrico: Formado por una sola capa celular pero las células son muc%o m"s altas, normalmente este tipo de epitelios son a1sor1entes. E&emplo- epitelio del est#mago. Epitelio si#ple cilínrico con capa estriaa: una capa diferenciada en la superficie (s#lo vías ". intestinales). . Epitelio pse$oestrati/icao cilínrico: Formado por varios tipos celulares pero todas ancladas a la 1ase (por lo que es simple). E&emplo- tr"quea, 1ronquios, oviductos y epidídimo. Epitelio pl$riestrati/icao plano: iempre %ay una primera capa de células denominada 5estrato 4. 1asal o germinativo6, este epitelio forma células poliédricas que lentamente se van aplanando y pueden o no (en algunos casos) diferenciar una capa de células muertas- capa cornificada o estrato c#rneo. E&emplo- es#fago y vagina %umana. 5. Epitelio pl$riestrati/icao plano corni/icao: En los %umanos la capa cornificada s#lo la presenta la epidermis. Epitelio poli#or/o: 3 urotelios (s#lo se da en las vías urinarias- ve&iga, uretra, etc.). e les llama 6. polimorfo o de transici#n porque se expanden, se aplanan, etc. an cam1iando de forma.
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1.
Co#plejo e $ni9n 7ni9n e ocl$si9n: 3 9#nula 3cludens. $a m"s apical. – Es %idrof#1ica e impide el paso de d e moléculas %idrofílicas. – – Estructurada por 3$4!I+, que poseen porci#n extracelular. $as ocludinas son proteínas transmem1ranas que al tener esta porci#n %idrof#1ica van a interactuar con la porci#n %idrof#1ica de la otra ocludina de la otra célula. ualquier molécula polar o con carga no va a poder atravesar este sello formado por las ocludinas. 'ientras m"s trenes de ocludinas, m"s impermea1le va a ser el epitelio. 'oléculas apolares que pasan con facilidad- alco%ol, drogas, etc. – 4na consecuencia de la existencia de la 1anda de oclusi#n (adem"s de formar este sello %idrof#1ico) es que evita que el constituyente molecular o las proteínas de un lado de la mem1rana se mezclen con las de la zona apical. 0$as uniones de oclusi#n impiden la difusi#n de las proteínas intrínsecas de la mem1rana celular entre el polo apical a 1asolateral. •
•
– – – –
7ni9n e aesi9n: 3 9#nula +d%erens. Interact:a con citoesqueleto de actina. *ermite asociar citoesqueletos de actina entre células vecinas. e u1ica 1a&o la uni#n de oclusi#n. ;equiere de a<= para su estructuraci#n. $a E2cad%erina es una proteína transmem1rana que se une a la E2 cad%erina de la célula del frente, para ello necesita alcio (a1undante en el intersticio) (se saca el alcio y la célula se separa). $a uni#n entre las E2cad%erinas es 1astante fuerte. Es una actividad %omofílica, una E2cad%erina se une a la del frente y a la vez %ay una serie de proteínas que permiten en :ltimo término conectarla con el citoesqueleto citoesqueleto de F2actina. Estas proteínas sona) catenina- toma la cola de la cad%erina y la asocia con vinculina. (12catenina(12catenina- act:a como factor de transcripci#n). transcripci#n). 1) vinculina 0 c) a2 actinina 0 (0siempre que %aya actina van a estar) 0$a actina es una proteína altamente conservada, la falodina tiene afinidad por la f2actina.
Des#oso#as: 3 '"cula +d%erens. *ermite asociar citoesqueletos de actina entre células vecinas. – Interact:a con F.I de Keratina. – !esmogleína y desmocolina- cad%erinas que tienen afinidad por la 5placa desmos#mica6 que est" – formada por varias proteínas, las cuales tienen afinidad por los F.I del citoesqueleto. •
*. de transmem1rana desmogleína
$igando extracelular y !esmogleína desmocolina.
*. de uni#n a F.I.
!esmosomas
aderinasdesmocolina.
y !esmoplaquina y placoglo1ina (le permiten interactuar cn el F.I.)
>emidesmoso mas
Integrina (se une a elementos propios $aminina y ol"geno imilar a desmoplaquina de la matriz). I
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(%eterotípico). *or un lado una célula forma una estructura de A conectinas que se unen a las A conectinas del frente y forman un poro y la uni#n de comunicaci#n es una masa grande de muc%os de estos poros. Entre los elementos que pasan por estos poros est"n- segundos mensa&eros como el alcio, el +'*c, 'agnesio, I**.
2. • •
%nclaje Contacto /ocal: 4ni#n del citoesqueleto de actina a la 1ase. He#ies#oso#as
-.ES,ECI%(IC%CIO+ES %,IC%(ES DE (OS E,ITE(IOS 1. Cilios: e pueden ver con '3. on m#viles, con forma de dedo. 7iene un e&e de citoesqueleto de microt:1ulos. *roteína motor. 2. icro!ellosiaes: on muc%o m"s pequeBas, m"s delgadas y cortas. 7ienen un citoesqueleto de F2 actina. 7ienen miosina tipo C y son capaces de acortarse, no son m#viles. 3. Esterocilios: itoesqueleto de actina. +1undan en el epidídimo. ". licoc;li<: Formadas por glicoproteínas y glicolípidos de mem1rana. Funci#n- receptores, enzim"tica, uni#n intercelular y matriz extracelular. -I.E,ITE(IOS (%+D7(%&ES 1. Secretores e proteínas: gl"ndulas serosas. *resentan un ;E; muy desarrollado, un n:cleo con dos o m"s nucléolos. 2. Secretoras e #$cosa: secretan mucus (car1o%idratos %idratados). 'uy desarrollado el aparato de olgi. 0!e acuerdo a la formaa= C>l$la calici/or#e: l"ndula unicelular. = l;n$la acinar: $umen pequeBo. l"ndula salival, p"ncreas, gl"ndula ecrina c= l;n$las al!eolares: $umen grande. l"ndula mamaria, gl"ndula sudorípara apocrina. 0negro- porci#n secretora 0plomo- conductos l"ndula tu1ular simple- +quellas que no tienen conducto. E&emplo- l"ndulas en el colon, l"ndulas sudoríparas.
Tejios CONECTIVOS: cartílago ? $eso I.C%&%CTE&'STIC%S: – – – –
oporte mec"nico. !efensa- algunas células de defensa. +lmacén- ya sea el intersticio que almacena iones o te&ido adiposo que almacena grasa. icatrizaci#n
II.)O&%DO ,O&: Elementos fi1rilares- fi1ras de col"geno que son fi1ras de resistencia.
–
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a1undantes fi1ras pero muy delgadas o de fi1ras un poco m"s gruesas pero poco numerosas. Tejio conecti!o enso orenao: $as fi1ras de col"geno son muy a1undantes y gruesas. 7odas las 2. fi1ras est" dispuestas en un s#lo sentido (e&emplo- tend#n). 3. Tejio conecti!o enso esorenao: $as fi1ras de col"geno son muy a1undantes y gruesas. $as fi1ras est"n dispuestas en distinto sentido. E&emplo- dermis. 0En los D anteriores predomina col"geno de tipo I. ". Tejio conecti!o retic$lar: El elemento m"s importante son las células. *resenta estroma (malla conectiva que sostiene al parénquima) de células reticulares y col"geno de tipo III. *resente en médula #sea %ematopoyética, te&idos linf"ticos, la malla conectiva del te&ido adiposo tam1ién es de te&ido conectivo reticular. (uando a1undan linfocitos de %a1la de 7.. $inforeticular).
I-.C@(7(%S DE (OS TEJIDOS CO+ECTI-OS: !erivan todas del mesodermo. on células pluripotenciales (célula troncal que es capaz de originar cualquier célula de cualquier te&ido). on capaces de originar vasos sanguíneos, elementos figurados de la sangre, células conectivas, células #seas y cartilaginosas.
1.
C>l$las estales (se origina de la célula troncal y %ace toda su vida en el mismo sitio. E&emplofi1ro1lastos y equivalentes equivalentes (osteo1lastos o condro1lastos)). condro1lastos)). )irolastos: intetizan matriz extracelular. ;E; y +parato de olgi desarrollados. an a sintetizar y mantener el te&ido conectivo. – – uando ya termina de sintetizar el material, la matriz conectiva 1a&a su nivel a un estado 1asal y se le llama /irocito . – >ay muy poco citoplasma en torno al n:cleo. élulas de gran tamaBo. – Encargado de la síntesis de todos los elementos de la matriz conectiva. $os elementos fi1rilares ya sea fi1ras el"sticas (éstas no se tiBen ni con colorante "cido ni 1"sico, se tiBen con colorantes apolares) o fi1ras de col"geno tipo I se o1servan con '3., el col"geno de tipo III no se o1serva con '3. 7odos estos elementos (células, elementos fi1rilares, etc.) est"n dentro de una matriz que uno no logra discernirS$stancia /$na#ental a#or/a que es un comple&o proteico muy complicado. – *ara conectar todo %ay una gran cantidad de glicoproteínas de asociaci#n que permiten asociar al fi1ro1lasto a la matriz conectiva y a los componentes entre sí. Est"n formados por – %= Col;geno: (de tipo I y III) 2 Es la proteína m"s a1undante del organismo. 2 ada molécula est" formada por D a2%élix. 2 CD de los a". son licina. $a glicina tiene como grupo ; un ><, es el a". m"s c%ico. 2 +ltos niveles de $isina y prolina que se %idroxilan, %idroxila n, formando ya sea %idroxilisina o %idroxiprolina. i no se %idroxilan (cuando falta vitamina o !) %ay pro1lemas con la formaci#n del col"geno. 2 7ropocol"geno 7ropocol" geno (s:per %élice de col"geno, formada por D polipéptidos)polipéptid os)- tiene en las puntas una porci#n glo1ular que evita que el col"geno polimerice dentro del fi1ro1lasto. 2 En la matriz extracelular %ay enzimas que cortan el extremo car1oxilo (car1oxipeptidasas) y otras que cortan el extremo amino (aminopeptidasas). Esto permite li1erar a las moléculas de col"geno de sus porciones glo1ulares y comienza la polimerizaci#n de la fi1rilla fi1rill a de col"geno (no se o1serva en '3). •
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de las lisinas) no se forman las moléculas de col"geno y se entra en un estado patol#gico- escorbuto. orbuto. 2 $a esta1ilidad de las fi1ras de col"geno (formadas por m:ltiples fi1rillas) se mantiene a través del ol"geno I, molécula pequeBa que permite pegar %artas fi1rillas y por otro lado se une a la otra molécula de col"geno I de la otra. 2 ol"geno I es una fi1ra gruesa o1serva1le a '3. El col"geno III forma fi1ras muy delgadas y no se o1servan a '3. i es un te&ido reticular s#lo %a1r" ol"geno III.
B= )iras el;sticas: A e estiran y reco1ran su longitud normal sin cam1ios químicos. 2 Elastina principal componente. Es una proteína el"stica que tiene gran cantidad de amino"cidos apolares (glicina y valina) y muy pocos a". con carga. Esta proteína se asocia a unas proteínas pequeBas llamadas fi1rilinas, las cuales dan el esqueleto y la esta1ilidad para formar las fi1ras el"sticas. 2 *resenta /irilina: molécula fi1rilar de CG nm. 2 Des#osina: amino"cido presente s#lo en la elastina. $a lisil2oxidasa agarra las @ $isinas y forma un anillo arom"tico entre ellas formando este amino"cido. amino"cido. Esto permite amarrar a @ péptidos de elastina. 2 +ltos niveles de licina y alina. 2 Falla en la expresi#n de fi1rilina causa síndrome de 'arfan. e forma te&ido el"stico pero son muy inesta1les. C= S$stancia /$na#ental a#or/a: 2 *ermite difusi#n de gases, desec%os y nutrientes. 2 Formada porI= licosa#inoglicanos: dímeros de car1o%idratos ;cios. !ímeros de = az:cares que se repiten muc%as veces. El "cido %ialur#nico (el m"s grande de todos) y el resto de los glicosaminoglicanos son como la matriz misma, donde ocurre la difusi#n de gases, líquidos y nutrientes. (El col"geno y las fi1ras el"sticas son impermea1les). % no s$l/ataos: Ácio ial$r9nico: rupos 332 (car1oxilo). 'olécula grande y lineal. o asociado a proteína central. !ímeros de "cido glucor#nico y 2glucosamina. % s$l/ataos: +sociados a proteína central. Esta proteína central se puede asociar al "cido %ialur#nico. -Heparan suf ato: ato: constituyente de la l"mina 1asal de los epitelios y de todas las células que expresan l"mina 1asal. -De rmatan sulfato/ Ke ratan sulfato /Condroitin sulfato. 000no existen car1o%idratos 1"sicos en la naturaleza II= ,roteoglicanos: una proteína asociada a glicosaminoglicanos. glicosaminoglicanos. III= licoproteína e asociaci9n (;#ina asal *resenta col"geno tipo I. – Es un componente de una estructura llamada 'em1rana 8asal- es una matriz conectiva externa que incluye a la l"mina 1asal < los componentes que permiten asociar a la l"mina 1asal a la matriz conectiva (col"geno II, col"geno III y otros). – Formada por- Colágeno IV, el IV, el cual es una especie de 1ast#n (tiene "ngulos) que polimeriza formando una especie de
–
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C>l$las aiposas: 7e&ido adiposo- formado por células adiposas, a1undantes vasos sanguíneos (endotelio), nervios y – organizado en panículos adiposos. Es un te&ido extremadamente meta1#lico. élulas que se encuentran en el paniculo adiposo- adipocitos, vasos sanguíneos (endotelio) y – células reticulares que forman una malla de col"geno tipo III. – $as nicas c>l$las conecti!as $e e
2.
C>l$las #igratorias: (se originan de un te&ido conectivo distinto) igratorias estales (se originan en un HG en la médula #sea %ematopoyética, via&an por la sangre, llegan al te&ido conectivo y se quedan a%í). I. acr9/agos: – !eriva del monocito (los monocitos derivan de la médula #sea %ematopoyética, circulan por la sangre y cuando llegan a un te&ido se diferencian a una célula fagocítica y una de ellas son los macr#fagos). Fagocitan y mantienen esterilidad de los te&idos. – – élula fagocitaria por excelencia. on grandes. – *oseen $isosoma secundario o fagolisosoma (cualquier célula con capacidad fagocítica lo presentar"). *resenta comple&o mayor de %istocompati1ilidad I y II- $os monocitos y los derivados de monocitos – expresan dos tipos de receptores (omple&o mayor de %istocompati1ilidad tipo I y II). 7odas las células del cuerpo (desde neuronas, m:sculos, etc.) tienen el '> tipo I, pero los monocitos y sus derivados expresan el I y el II. •
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la via linf"tica, etc. y van recorriendo el cuerpo). I. C>l$la plas#;tica: e originan de linfocitos 8. – ecretan anticuerpos Ig% (normalmente se secreta por gl"ndulas. E&emplos- glandula salival es muy – rica en Ig+, tam1ién lo es la lec%e materna, las vías digestivas y respiratorias), IgD, Ig (receptores de superficie), Ig (técnicas inmunol#gicas) e IgE. (on las :nicas células capases de secretar anticuerpos). – *resenta un ;E; muy desarrollado. 4no o dos nucleolos centrales. – 7iene afinidad por la %ematoxicilina por la presencia de los ri1osomas so1re el ;E; y afinidad por la eosina por las proteinas que est"n sintetizando. on células de secresi#n constitutiva- fa1rican su material y lo secretan inmediatamente, no – necesitan de seBales externas. – 7ienen una vida media de =G días.
II. (e$citos !arios
C%&T'(%O 8 H7ESO 1. C%&T'(%O – 7e&ido que resiste muy 1ien a la fuerza de compresi#n. – ol"geno tipo II y proteoglicanos. 7ienen principalmente agua, generalmente JG del peso. – !erivado del mesénquima. $as células que ya est"n siendo parte del te&ido cartilaginoso son los – conrolastos (no %an expresado su matriz territorial, rodeado por matriz interterritorial) ? conrocitos (posee matriz territorial y la sintetiza) . $as células capaces de dividirse y reemplazar a las células que se est"n perdiendo son las c>l$las conroprogenitoras (células troncales del te&ido cartilaginoso). – $as células que se encierran en una matriz cartilaginosa tienen la capacidad de seguir diviendose a pesar de ser células diferenciadas y estar dentro de la matriz. Estas células que se dividen (condrocitos) pueden estar solos o formar agregados celulares dentro de la matriz cartilaginosa- gr$pos is9genos que son grupos de células cartilaginosas derivados de una sola. $as células cartilaginosas al estar dividiéndose, siguen secretando matriz cartilaginosa, por lo tanto – el cartílago va creciendo desde adentro. Este tipo de crecimiento es propio del cartílago y es vital para el crecimiento de longitud de los %uesos, el cual depende de la met"fisis (placa de cartílago) que 5a1usa6 de la capacidad del cartilago de crecer intersticialmente. 1. ,ericonrio /iroso: tiene fi1ras de col"geno tipo I y – fi1ro1lastos. 2. ,ericonrio cel$lar: tiene las células
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c= El;stico: artílago %ialino penetrado por fi1ras el"sticas. 7inci#n +zul de toluidina y an ieson er%oeff. E&emplo- pa1ell#n de la ore&a, puente de la naríz. I.%T&IF C%&TI(%I+OS% C%&TI(%I+OS% ol"geno tipo II (reestrictivamente del cartílago %ialino) %ialino ) forma fi1rillas pero no no fi1ras, ya que so1re él est" asociado con col"geno I (pequeBo), el cual se une a cualquier cosa menos a otros tipos de col"genos (en este caso se une a los glicosaminoglicanos) esto provoca que el col"geno II esté disperso y separado y evita que se formen fi1rillas de éste. – cido >ialur#nico – *roteoglicanos sulfatados- uno de los m"s a1undantes y uno de los m"s grandes es +gregac"n ulfato. $os glicosaminoglicanos est"n en forma recta y poseen una gran carga negativa, lo que provoca que atraigan cosas con cargas positivas, una de ellas que a1unda en el intersticio es el odio, el cual no anda solo sino que tiene una 1ur1u&a de agua que lo rodea. Entonces tenemos una matriz conectiva muy %idratada, pero el agua est" retenida por la gran cantidad de cargas que %ay. ondronectina conecta agragacanes con integrinas de condrocitos. – – 4na particularidad del cartilago %ialino es que no es penetrado por vasos sanguíneos, la irrigaci#n irri gaci#n de las células cartilaginosas proviene de la circulaci#n que est" en el pericondrio fi1roso, por eso los cartílagos no de1en ser excesivamente gruesos, adoptan una forma que permite acercar lo m"s posi1le la circulaci#n a las células m"s profundas. –
II.C%&T'(%O %&TIC7(%& Es un cartílago cartíla go %ialino. arece de pericondrio ya que en la articulaci#n %ay roce mec"nico, por – ende cualquier elemento que esté so1re la estructura cartilaginosa se rompe. 7ampoco %ay células condroprogenitoras, por lo tanto, cualquier ruptura del cartílago articular trae como consecuencia que la regeneraci#n es muy lenta. ;esiste muy fuertemente la fuerza de compresi#n. E&emplo- el cartílago de la ca1eza del fémur. +l – presionar este cartílago se li1erar" un poco de agua (que est" retenida en la matriz cartilaginosa), lo cual permite que la gran cantidad de cargas (ya sean negativas o positivas) se acerquen entre sí, lo cual no le gusta. !e tal manera que cuando se de&a de e&ercer fuerza so1re el cartílago, inmediatamente recupera el agua que perdi# que normalmente se va %acia el líquido sinovial, por lo tanto act:a como un amortiguador. $a disposici#n del col"geno permite que no se deforme el cartílago. 'ayor proporci#n de col"geno tipo II (es m"s eosin#filo). –
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monocitos que dan origen a osteoclastos, los cuales empiezan a perforar un t:nel. $uego vienen las celulas mesenquematicas con celulas osteoprogenitoras que generar"n osteo1lastos, tam1ien vienen vasos sanguineos y un nervio. $os osteo1lastos comienzan a formar laminas de te&ido #seo cerrando el t:nel que formaron los osteoclastos- esto forma el sistema de %avers. Este sistema es una estructura cuyas laminas de colageno estan perpendicular una de otra, las cuales resisten la fuerza de compresi#n y fracci#n. – $os sistemas de %avers ( u osteonas) son una estructura cilíndrica propia del %ueso compacto. – 7e&ido #seoatri org;nica: 2 ol"geno tipo I que en vez de formar fi1ras, forma l"minas. Estas fi1rillas de ol"geno tipo I se calcifican cuando precipitan los cristales de %idroxiapatita de alcio. 2 =G agua 2 *roteoglicanos atrí inorg;nica: 2 ristales de %idroxiapatita de alcio.
I.C>l$las: a= Osteoprogenitoras = Osteolastos: A élula capaz de sintetizar la matriz #sea. 2 +1undante ;E;. 2 !isposici#n pseudoepitelioide. o es un epitelio, son células conectivas que adoptan una estructura cerrada parecida a un epitelio. 3tra cosa que pasa con el te&ido #seo es que la superficie superfici e del del %ueso nunca est" en contacto directo con el intersticio, siempre %ay un tipo de célula que est" en la superficie del te&ido #seo, pueden ser osteo1lastos, osteoclastos u osteo1lastos inactivos, éstos :ltimos se aplastan y forman una l"mina muy planas que se llaman células limitantes. 2 Entre la l"mina de osteo1lastos y el %ueso calcificado siempre %ay una zona de %ueso no calcificada. $a zona de %ueso de col"geno que est" siendo secretado por los osteo1lastos y no %a sido calcificada se denomina osteoie. c= Osteocitos: 3steo1lastos que quedan atrapados en la matriz #sea. $a matriz #sea calcificada es una matriz impermea1le, es un pro1lema porque una célula atrapada en la matriz #sea tendr" pro1lemas de nutrici#n y oxigenaci#n. uando se va formando el te&ido #seo y el oste1lasto queda atrapado, nunca pierde contacto con las células de la superficie, %ay comunicaicones que se mantienen a través de un conducto llamado canalíc$lo 9seo forman gap &unctions entre ellos. Entonces, por muy profundo que esté el osteocito en el te&ido #seo, siempre tendr" una vía de comunicaci#n. 2 ;odeado de matriz osea. 2 +lo&ado en laguna y canalículos #seos. 2 'antienen la matríz #sea.
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cartilago %ialino, el cual en la parte central se calcifica y al ser calcificado aparecen los osteoclastos que son capaces de remover te&ido oseo (en este caso cartilago calcificado) %acen perforaciones y detr"s de ellos aparecen las células progenitoras que comienzan a depositar %ueso so1re el cartilago calcificado. En el caso de los %uesos largos, la primera parte calcificada ser" la futura di"fisis del %ueso y, posteriormente se forman otros dos centros de calcificaci#n que ser"n las futuras epífisis, entremedio queda una zona cartilaginosa que ser" la placa de crecimiento epifisiaria o met"fisis. El dep#sito de %ueso secundario siempre requiere una matriz calcificada, puede ser %ueso preexisten preexistente te o cartíla cartílago go calcificado. calcifi cado. E&emplo%uesos largos, falanges, vérte1ras, etc. = e#ranosa >r#ica pri#aria o retic$lar : A e forman nucleaciones de te&ido #seo primario a partir de te&ido mesenquem"tico. 2 Es reemplazado por te&ido #seo secundario o laminillar. A !esde un te&ido mesenquem"tico comienzan a expresarse proteínas propias del te&ido #seo, secretan col"geno en forma laxa y se calcifican formando una pequeBa placa de %uesos calcificados, muy desordenados y que la :nica gracia que tienen es que le dan un soporte calcificado al soporte de %uesos secundarios que es el que tiene resistencia mec"nica. o %ay una interface cartilaginosa. E&emplo- %uesos planos, %uesos del cr"neo, clavícula.
III.C&ECIIE+TO E+ &OSO& DE (OS H7ESOS – 7odos los %uesos por fuera tienen una capa de te&ido conectivo llamada ,eriostio. Osta tiene una parte fi1rosa rica en fi1ras de col"geno I, fi1ro1lastos y vasos sanguíneos, y una parte celular llamado periostio cel$lar donde tiene células condroprogenitoras que se diferencian a osteo1lastos, los cuales generar"n %ueso so1re el %ueso ya existente. – El crecimiento en grosor de los %uesos depende de la actividad del periostio. I-.&E7(%CI*+ HO&O+%( DE( C%(CIO Hor#ona paratoiea ,arator#ona=: >ipercalcemiante. +ct:a so1re osteo1lastos in%i1iendo la secreci#n de OSTEO,&OTEE&I+% permitiendo actuar a la &%+( so1re los osteoclastos. El osteoclasto secreta una serie de proteínas, una de ellas es la osteoprotegerina, la cual es una proteína que in%i1e al osteoclasto. $a parat%ormona act:a so1re el osteo1lasto para que secrete otra proteínaP la ;+$, la cual empieza a interferir con la osteoprogeterina, peg"ndose a ella y removiéndola del medio, al no %a1er osteoprogeterina se activa el osteoclasto. Calcitonina: >ipocalcemiante. +ct:a directamente so1re osteoclastos, inc%i1iéndolos, así éstos de&an de remover %ueso calcificado, se de&a de li1erar calcio del %ueso y por lo tanto 1a&an los niveles de alcio. •
•
-.&%7ITISO 8 OSTEO%(%CI% !éficit nutricional de alcio y Fosfato – – Falta de vitamina ! y en la dieta. +l no %a1er ninguna de éstas vitaminas, no %ay cofactor para la enzima necesaria para la síntesis de col"geno.
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2 7alla delgada. 2 >ipertiroidismo. 2 !eficiencia de alcio en la dieta.
-II.&E,%&%CI*+ SEC7+D%&I% C%((O )IB&OC%&TI(%I+OSO= 2 uando se rompe un %ueso, %ay ruptura de vasos sanguíneos. e cierran los vasos que irrigan la zona, %ay un proceso de %ipoxia. $as células osteoprogenitoras y condroprogenitoras son las mismas, si se someten a 1a&os niveles de oxígeno se derivan %acia la serie cartilaginosa, si se eleva la presi#n parcial de oxígeno derivan %acia la serie #sea. +l %a1er una caída de la *.*arcial de 3=, las células osteoprogenitoras de esta zona derivan a condroprogenitoras, formando un callo cartilaginoso /irocartilago= , cartílago transitorio que se calcifica y posteriormente es reemplazado por te&ido #seo.
T ejido NERVIOSO. ejido NERVIOSO. Músculo Músculo e sque squeléti létic co, c o, cardia ardiac co y lil so iso.
TEJIDO +E&-IOSO !eriva en su HH del neuroectoderma, el cual origina el tu1o neural y cresta neural (cresta neural – dar" origen a los elementos del *). – onduce seBales electroquímicas a larga distancia y a gran velocidad. I.SISTE% +E&-IOSO CE+T&%( 7e&ido nervioso en el - pericarion neuronal rodeado de prolongaciones de células gliales, – terminales ax#nicos y dendritas. El material intercelular es mínimo, lo m"s reconoci1le son las neuronasn:cleo enorme, pueden tener uno o dos nucleolos y siempre la cromatina se ve descondensada por su gran actividad sintética. *oseen gran cantidad de mitocondrias, mitocondri as, ;E; y u +parato de olgi enorme. enorme. 7anto
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2. %stroglias: %strocito I: 2 e asocian a la l"mina 1asal de los capilares sanguíneos y de la pia madre. 2 ;odean los vasos saguíneos formando parte de la arrera e#atoAence/;lica y forman la glia limitante su1yacente a la pia madre.
B%&&E&% HE%TOE+CE)Á(IC% – Formada por prolongaciones de +strocitos tipo I que envuelven los capilares sang:ineos, cuyo endotelio presenta 1anda de oclusion muy desarrollada. omo los +strocitos tienen afinidad por la l"mina 1asal, cualquier elemento que quiera pasar %acia el te&ido nervioso (principal (principalmente mente !2glucosa y amino"cidos) lo %ace a través través de el astrocito. astrocit o. Esto es tan selectivo que la !2glucosa (utilizada por el meta1olismo de las neuronas) pasa f"cilmente, pero la $2glucosa no puede atravesar. – *ermite transporte selectivo %acia el . – #lo pasan compuestos liposolu1les con facilidadP etanol, nicotina. %strocito II: 2 'antienen constantes los niveles de K< alrededor de las sinapsis. 2 ;emueve el exceso de neurotransmisores. 2 e asocian al soma neural y a los nodos de ;anvier. 07anto
%=
los astrocitos tipo I y tipo II, dependiendo dependiendo de la u1icaci#n, se clasifican en%strocito /iroso: se encuentran en la sustancia
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estar formados por un s#lo fascículo. 2
$os fascículos est"n rodeados por una envoltura con&untiva llamada epine$ro éste te&ido rodea a todos los fasciculos por fuera y mantiene la integridad del nervio completo, puede tener incluso células adiposas. e o1serva col"geno de tipo I y III, vasos sanguineos, fi1ro1lastos, fi1ro1la stos, etc. 2 ada fasciculo est" rodeado por un te&ido especial llamado perine$ro , el cual rodea a +!+ 43 de los fascículos por separado. Es una capa de células epiteliales alternadas con fi1rillas delgadas de ol"geno de tipo III (no %ay ol"geno I). Formado por células gliales especializadas llamadas células del perineuro (expresan l"mina 1asal). 2 Intimamente, dentro del fasciculo %ay un te&ido reticular (rico en col"geno III) llamado enone$ro el cual se encuentra rodeando las fi1ras nerviosas (cuando se %a1la de fi1ras nerviosas se %ace referencia al axon + la célula de schawn que awn que lo rodea, por lo tanto, se %a1la de fi1ra nerviosa en el *). 2 o %ay neuronas en los nervios. Formado por células nerviosas2. +e$ronas: Estr$ct$ra el a<9n: A El ax#n o cilindroe&e es la prolongaci#n m"s larga de la neurona, puede medir metros. 2 omienza en el cono ax#nico y est" formado por citoplasma, un citoesqueleto de microt:1ulos (esenciales para el transporte a nivel del ax#n) y neurofilamentos.
– •
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%asta que logran la regeneraci#n. $a regeneraci#n depende de la existencia del tu1o endoneural (l"mina 1asal), que permite un camino que reinerve esta neurona que fue seccionada.
&eceptores sensoriales: 2$os sentidos tradicionales son(a !isi9n con s$ receptor: la retina. -3&o
– – – –
Escler#tica- capa conectiva. ristalino- de origen epitelial. $igamentos suspensores- ligamentos el"sticos. ;etina- capa nerviosa del o&o.
(a a$ici9n con s$ receptor: el 9rgano e Corti El ol/ato con s$ receptor: ne$roepitelio 2;eceptores olfatorios$as células sensoriales olfatorias son neuronas. eurona 1ipolar que posteriormente genera el nervio – olfatorio. *resentan largos cilios cuya mem1rana posee receptores específicos para distintas moléculas – solu1ilizadas en el mocus li1ra que recu1re la superficie de la neurona olfatoria.
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2 us velocidades de conducci#n son altas (aprox. @GG mseg). 2 $a onda de depolarizaci#n se transmite por los nodos de ranvier. R )or#aci9n e la ielina: A El origen de la 'ielina es de una célula de c%a/nn que es aislada por el aumento de di"metro del ax#n, ésta célula interiormente empieza a dar vueltas y expresa una proteína (*roteína G - proteína %idrof#1ica similar a las ocludinas que asocia las caras citoplasm"ticas y extracelular de la mem1rana en *.) que permite la fusi#n de las mem1ranas de la misma célula de c%a/nn y así se genera la mielina. 2 En el las células de oligodendroglias en vez de expresar la *roteína G, expresa la proteína ;sica e la #ielina y un protolipio que se une por la porci#n extracelular.
Con$cci9n saltatoria !Ls con$cci9n p$nto a p$nto
Con$cci9n p$nto a p$nto: $os canales de a< y K< se encuentran en toda la mem1rana, por lo tanto la depolarizaci#n y repolarizaci#n ocurren punto a punto. $as velocidades m"ximas son de Cmseg aprox. Con$cci9n saltatoria: $os canales est"n restringidos a la zona del nodo de ;anvier, por lo tanto
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Clase ": !asos sang$íneos Sangre He#atopo?esis ? 9rganos lin/;ticos sec$narios
%parato Cario!asc$lar I. Cora9n: istema de marcapasos- odo sino auricular y +uriculoventricular, que coordinan y regulan la contracci#n del coraz#n (rítmica). II. -asos sang$íneos: %ay distintos tipos, depender" del cali1re y de cu"n cerca estén del coraz#n. %rterias el;sticas: +orta, vasos que salen directamente del coraz#n. 7ienen un material el"stico dispuesto en capas y no en fi1ras. %rterias #$sc$lares e istri$ci9n=: *ared formada principalmente por m:sculo liso, tienen material el"stico (no se distingue a '3) pero no tan a1undante como la +orta. >ay de gran, mediano y pequeBo cali1re. %rteriolas reg$lan presi9n sang$ínea=: $as arterias de pequeBo cali1re dan origen a la microcirculaci#n (se %ace referencia a aquellos componentes de la circulaci#n que s#lo pueden ser o1servados con un instrumento de aumento). Capilares
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-I. -asos sang$íneos %rterias el;sticas o e con$cci9n: a= Tnica ínti#a: Endotelio. 7e&ido con&untivo laxo y fi1ras de m:sculo liso longitudinal. En las porciones iniciales al coraz#n no %ay m:sculo liso en la t:nica media, a nivel de la +orta a1dominal a1dominal comienza a aparecer. = Tnica #eia: ':sculo liso como :nico elemento celular. *oseen entre @G2JG l"minas el"sticas fenestradas (poros) +orta %umana). El"stica Externa. 7odo el material extracelular de la t:nica media es sintetizada por las células musculares lisas, que sintetizan col"geno, material el"stico y todas las proteínas que permiten ensam1lar estos componentes. c= Tnica a!enticia: 7e&ido con&untivo denso desordenado, fi1ras el"sticas fi1ro1lastos y vasa vasorum. $os vasa vasorum irrigan la t:nica adventicia, no logran meterse a la t:nica media ya que la tensi#n que e&erce la presi#n sanguínea so1re la pared de las arterias es demasiado y no permite la filtraci#n de vasos sanguíneos porque colapsa. $a nutrici#n y mantenimiento de las t:nicas media e íntima depende netamente del material que vaya circulando por el lumen. = )$nci9n e las arterias el;sticas: !urante la sístole almacena energía potencial en sus l"minas el"sticas *ermite mantener continua la presi#n arterial. = %rterosclerosis: %rterosclerosis: Estrec%amiento del lumen de la arteria coronaria o arterias cere1rales. e altera la estructura de los vasos sanguíneos (especialmente los vasos coronarios) cuando %ay exceso de
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+ctividades meta1#licas del endotelio. 'eta1olismo de sustancias vaso2activas. >emostasis- produce sustancias coagulantes y el in%i1idor y activador del plasmin#geno. ustancias que modifican contracci#n del m:sculo liso- vasodilatadores como 3 (#xido nitroso), vasoconstrictores como Endotelina I (antag#nico al 3). - Formados por una l"mina endotelial (epitelio) y por fuera %ay una célula contr"ctil llamada pericito (tiene l"mina 1asal). a= Capilares contin$os: itoplasma continuo que asila el plasma sanguíneo. · Extremadamente selectivo. Forman la 1arrera %emato2encef"lica. · · umerosas !esíc$las citoplas#;ticas e transitosis. Estas vesículas van a endocitar material ya sea desde el lumen %acia la zona 1asal o viceversa pero de forma directa, sin pasar por un lisosoma, por ende no modifica el material que %a sido digerido (en endocitosis siempre %ay fusi#n con lisosomas). $"mina 1asal continua. · 4ni#n de oclusi#n muy desarrollada. · Est"n en te&ido nervioso (1arrera %emato2encef"lica), m:sculo, te&ido con&untivo (en la mayoría, · excepto te&ido conectivo visceral) y p"ncreas. = Capilares /enestraos: -
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= Tnica #eia: *ueden ser gruesas con T2CG capas musculares (ava inferior) o delgada de = capas musculares (ava superior). c= Tnica a!enticia: ruesa y con paquetes de m:sculo liso longitudinales. 7am1ién poseen v"lvulas venosas. 2 $o interesante de los vasos venosos, especialmente de las enas avas es que secretan una serie de elementos, por e&emplo el factor III de la coagulaci#n. En la vena cava superior la t:nica media puede tener entre T a CG capas de m:sculo liso, la t:nica adventicia es enorme y pr"cticamente no tiene t:nica media. En cam1io en la vena cava inferior la t:nica adventicia presenta un material que no est" presente en la .ava uperior, que corresponden a paquetes de m:sculo liso que se disponen en forma longitudinal al vaso. omo la vena cava inferior est" recogiendo sangre desde a1a&o éste m:sculo liso se contrae y empu&a la sangre %acia arri1a. 2 $as v"lvulas venosas se encuentran en venas que se encuentran desde el coraz#n %acia a1a&o. -III. Tipos e !asos sang$íneos +rterias el"sticas conductoras +rterias musculares o
o (+orta) =,Q2Ccm di"metro =mm grosor de DGum2Ccm di"metro Cmm grosor
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receptores de los gl#1ulos ro&os. uando esto falla de1ido a una mutaci#n en la Espectrina, no se esta1iliza el cito2esqueleto del gl#1ulo ro&o y adquiere una forma redondeada- Esferosis %ereditaria, no es mortal pero tiende a %a1er muc%a %em#lisis. 'iden de J2Tum de di"metro y =um de espesor. Est"n encargados en el transporte de 3= y en menor cantidad de 3=. o tienen organelos. Es esencial que no posean mitocondrias ya que si las tuvieran, éstas consumirían el oxígeno que est"n transportando. *or lo tanto toda la energía (+7*) que utiliza el gl#1ulo ro&o lo %ace a través de glucolisis.
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-. egacariocitos - élula de gran tamaBo (CGG micrones). 4n n:cleo grande y poliploide (A@n) (varias copias de !+). !eriva de la F42E''. - Es una célula que comienza a dividir muc%as veces su material genético, lo1ula su n:cleo (megacario1lasto) y cuando ya comienza la producci#n de plaquetas se denomina megacariocito. - $as plaquetas son extremadamente sensi1les. uando se activa una plaqueta lo primero que %ace para formar un trom1o es depolimerizar el cito2esqueleto de +ctina, formando una red de plaquetas atrapando elementos figurados. ormalmente este co"gulo se contrae y lo %ace asociando la red de
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ne$tr9/ilo y el que a1andona la médula #sea %ematopoyética %ematopoyética es el ne$tr9/ilo en ana. on el tiempo va lo1ulando m"s su n:cleo %asta llegar a ser un neutr#filo adulto. El eosin#filo en vez de expresar gr"nulos neutros, expresa gr"nulos Eosin#filos pero no lo1ula su n:cleo, sino que llega %asta la etapa de dos n:cleos.
-III. onocitos c>l$la e #a?or ta#aMo en la sangre= - itoplasmas con gr"nulos azur#filos, levemente 1as#filo. :cleo grande descondensado y cuando sale de la médula #sea %ematopoyética pueden seguir fa1ricando organelos.
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)$nci9n in#$nol9gica el Ti#o: Cortea2 >ay una selecci#n clonar y cuando se seleccionan y se forman los linfocitos capacitados, éstos pasan a la médula y son capaces de a1andonar el 7imo. 2 $os vasos sanguíneos est"n tapizados con las mismas células epitelio2reticulares formando la 1arrera >emato2timica. $as células epitelio2reticulares est"n exponiendo todas las proteínas que el individuo es capaz de producir y todo linfocito capaz de reconocer esas proteínas no las destruir". i pasa un antígeno extraBo a la orteza, el 7imo lo va a reconocer como algo propio y va a generar todos los
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· ·
Cortea: e divide en dos zonas- corteza nodular (a1undan n#dulos linf"ticos) para-corteza o corteza profunda (venas profunda (venas post2capilares) y >$la. ;eci1e linfa y antígenos de varios vasos linf"ticos aferentes y sale por un :nico vaso eferente. $a linfa entra por los vasos linf"ticos aferentes (a nivel de las c"psulas) y se mete por el seno s$Acaps$lar (espacio entre el te&ido conectivo de la "psula y el te&ido reticular de la orteza), luego se mete por el espacio entre las tra1éculas- senos traec$lares, que convergen en los senos #e$lares y terminan en el !aso lin/;tico e/erente. Eventualmente este vaso linf"tico eferente va a terminar en otro ganglio y se convertir" en el vaso linf"tico aferente de ese ganglio.
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+rterias central se conectan directamente a las venas.
IN.
Erecci9n - +rteria nutricia nacen arterias %elicinas que se vacian a los senos venosos comprimiendo el te&ido conectivo y las venas periféricas dificultando la salida de la sangre de los senos venosos. - ;ela&aci#n de musculo liso tra1ecular - !ilataci#n de misculo liso de arteria %elicina - Estimulaci#n externa e interna - *aricipacion de acetil colina y oxido nitroso
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IFE;7I$I!+! '+4$I+ - Ca$sas e la in/ertilia #asc$lina - poca producci#n de espermatozoides, se eval:a una oligoespermia o +zoospermia. - +lteraci#n en las secreciones glandulares. - olapso de conducto esperm"tico. - 7oxicidad ('ari%uana, alco%ol, plomo, +renisco, etc.). - Infecciones. - aricocele testicular. - Impotencia.
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Dis/$nciones er>ctiles- !ia1etes, ta1aquismo (nicotina), alco%ol, anfetaminas, 1ar1it:ricos, %eroína, esteroides ex#genos, medicamentos. ;uptura de ligamento peneano. Fractura de cuerpo cavernoso. Falta de estimulaci#n para simp"tica. E&. irugías de pr#stata. itrato de idenafil (viagra), usos cuando no %ay lesi#n nerviosa.