Preguntas de Repaso Embriología 1ER CAPITULO 1.1.- Dura Durant ntee la espe esperm rmat atog ogn nes esis is!! "#u "#u sust sustitu itu$e $e a las las %ist %iston onas as para para perm permititirir un me&o me&orr empa'uetamiento de la (romatina (ondensada en la (abe)a del espermato)oide* La protamina. +.- "#u tipo de (lula se lo(ali)a ,uera de la barrera %ematotesti(ular* %ematotesti(ular* La espermatogonia. .- "Cul de las siguientes (lulas e/perimenta normalmente las di0isiones mitti(as* La o0ogonia. 2.- En una radiogra,ía de tra/ de rutina! el radilogo 0e lo 'ue pare(e ser un diente en una masa mediastíni(a. mediastíni(a. "Cul es el posible diagnsti(o $ (ul sería la e/pli(a(in embriolgi(a embriolgi(a ms posible de su aparien(ia* Un teratoma mediastíni(o! 'ue probablemente se %a originado a partir de una (lula germinal primordial aberrante 'ue 'ued atrapada en el te&ido (on&unti0o (er(a del (ora)n. 3.- "Cundo (omien)a la meiosis en la mu&er $ el 0arn* En la mu&er! la meiosis se ini(ia durante la 0ida embrionaria4 en el 0arn! en la pubertad. 5.- "En 'u etapas de la o0ognesis se detiene la meiosis la mu&er* En la pro,ase 67ase de diplotene8 de la primera di0isin meiti(a $ en la meta,ase de la segunda di0isin meiti(a. 9.- "Cul es la (ausa sub$a(ente n la ma$oría de los abortos espontneos durante las primeras semanas de la gesta(in* Anoma Anomalía líass (romos (romosm mi(a i(ass (omo! (omo! (omo (omo la polipl poliplodí odíaa o las trisom trisomías ías de deter determin minado adoss (romosomas. :.- "#u di,eren(ias %a$ entre la espermatognesis $ la espermiognesis*
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La espermatognesis el pro(eso (ompleto de ,orma(in de los espermato)oides a partir de una espermatogonia. Comprende las di0isiones meiti(as $ el periodo de espermiognesis. Esta ;ltima! o metamor,osis de los espermato)oides! es el pro(eso de trans,orma(in de una espe esperm rmt tid idee posme osmei ititi(a (a 'ue 'ue tien tienee el aspe aspe(t (too de una una (lu (lula la ordin rdinar aria ia en una espermato)oide mu$ espe(iali)ado. <.- "#u %ormonas son las responsables de los (ambios del endometrio durante el (i(lo menstrual* Los estrgenos! segregados por el o0ario! mantienen la ,ase proli,erati0a preo0ulatoria. Desde Desde el moment momentoo de la o0ula o0ula(i (in! n! el (uerpo (uerpo l;teo l;teo produ( produ(ee grand grandes es (anti (antidad dades es de progeste progesterona rona!! 'ue es la responsabl responsablee de la ,ase se(retora! se(retora! en la 'ue el endometrio endometrio se prepara para la implanta(in del o0ulo. 1=.- "#u "#u dos %ormonas %ormonas reprodu(tor reprodu(toras as prin(ipale prin(ipaless estimulan estimulan a las (lulas (lulas de >ertoli en los testí(ulo* La 7>? produ(ida por la adeno%ip,isis adeno%ip,isis $ la testosterona generada generada por las (lulas de Le$dig del testí(ulo.
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+DO CAP@TULO 1.- De las barreras para la super0i0en(ia $ el transporte de los espermato)oides en el aparato reprodu(tor ,emenino! ,emenino! el p? ba&o tiene ms rele0an(ia en La 0agina +.- La prin(ipal ,uente de energía para los espermato)oides e$a(ulados es La ,ru(tosa en el lí'uido l í'uido de las 0esí(ulas germinales. .- "Cul es el prin(ipal estimulo %ormonal para la o0ula(in* El aumento s;bito de produ((in de L? por parte de la adeno%ip,isis 2.- "#u es la (apa(ita(in* La (apa(idad es un intera((in po(o (omprendida entre un espermato)oide $ los te&idos del tra(to reprodu(tor ,emenino 'ue in(rementa la (apa(idad del espermato)oide para ,ertili)ar el o0ulo. En algunos mamí,eros la (apa(ita(in es obligatoria! pero en el ser %umano es menos importante. 3.- "Dnde o(urre la ,e(unda(in* La ,e(unda(in o(urre por lo general en la ter(io e/terno de la trompa uterina 5.- Cite dos ,un(iones de la proteína BP presente en la )ona pel;(ida La BP a(t;a (omo un re(eptor espe(í,i(o de los espermato)oides a tra0s de sus re(eptore re(eptoress de membrana membrana O-oligosa O-oligosa(ri (ridos4 dos4 para estimular estimular la rea((in rea((in a(rosmi a(rosmi(a (a es ne(esaria la e/posi(in de gran parte de su soporte polipeptídi(o. 9.- "#u es la poliespermia $ (mo se e0ita despus de 'ue un espermato)oide entre en el 0ulo * La poliespermia es la ,e(unda(in del o0ulo por ms de un espermato)oide. >e e0ita por el rpido blo'ueo el(tri(o de la membrana plasmti(a del o0ulo $ por la rea((in de )ona posterior! posterior! a tra0s de la (ual los produ(tos liberados por los grnulos (orti(ales ina(ti0an los re(eptores del espermato)oide en la )ona pel;(ida. :.- Una mu&er da lu) a septilli)os "Cul es la (ausa ms probable del parto m;ltiple* La pa(ien pa(iente te %abía %abía tomado tomado probab probablem lement entee (lomi, (lomi,en enoo para para estimu estimular lar la o0ula o0ula(i (in. n. El
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La introdu((in de ms de un embrin en la trompa ,emenina es ,re(uente debido a 'ue son mu$ es(asas las posibilidades de super0i0en(ia de un ;ni(o embrin implantado %asta el momento del parto. o se %an determinado las ra)ones de ello. Los embriones adi(ionales son (ongelados debido a 'ue si la primera implanta(in no (ulmina en el embara)o! es posible implantarlos sin la in(omodidad $ el gasto de obtener 0ulos a partir de la madre para su ,e(unda(in in 0itro. 1=.- "Por'u algunos (entros de te(nología de la reprodu((in introdu(en espermato)oides ba&o la )ona pel;(ida o in(luso dire(tamente en el o0o(ito* En los (asos de in(ompatibilidad in(ompatibilidad entre el espermato)oide espermato)oide $ el 0ulo! de motilidad es(asa de los espermato)oides espermato)oides o de de,i(ien(ia de re(eptores de los mismo en la )ona! la introdu((in de di(%os espermato)oides dire(tamente en el 0ulo o (er(a de l puede sosla$ar un punto dbil en la se(uen(ia de a(onte(imientos de la produ((in.
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ER CAP@TULO 1.- "Cul es la entidad 'ue (on ms ,re(uen(ia se aso(ia a los embriones 'ue su,ren un aborto espontaneo* Las anomalías (romosmi(as. +.- "#u "#u te&ido te&ido en ,ase ,ase de implan implanta( ta(in in entra entra en (onta (onta(to (to dire(t dire(too (on el te&ido te&ido (on&u (on&unti nti0o 0o endometrial* El sin(itiotro,oblasto. sin(itiotro,oblasto. .- "ediante 'u pro(eso o 'u propiedades del embrin en su ,ase temprana es posible el ,enmeno de gemelos idnti(os* La regula(in. 2.- La )ona pel;(ida Impide la implanta(in prematura del embrin en ,ase de segmenta(in. 3.- "#u rele0an(ia tiene la masa (elular interna del embrin en el periodo de segmenta(in* El (uerpo embrionario propiamente di(%o se origina a partir de la masa (elular interna. 5.- La impronta parental es un ,enmeno 'ue demuestra (ierta disparidad entre la in,luen(ia de determinados (romosomas %omlogos maternos $ paternos sobre el desarrollo del embrin "#u tipo de te&ido se ,orma de manera anmala por un e/(eso de in,luen(ia paterna a e/pensas del desarrollo del propio embrin* Los te&idos tro,oblsti(o tr o,oblsti(os. s. 9.- "Cul es la ,un(in de la integrinas en la implanta(in* implanta(in* Permiten 'ue el tro,oblasto embrionario se ad%iera al endometrio. :.- "Cul es el origen (elular del sin(itiotro,oblasto del embrin en ,ase de implanta(in * Las (lulas pro(edentes del (itotro,oblasto se ,usionan para ,ormar el sin(itiotro,oblasto. <.- Una mu&er embara)ada de + o meses (omien)a a su,rir de ,orma brus(a un dolor %ipogstri(o intenso "#u entidad debe in(luir el mdi(o en el diagnsti(o di,eren(ial*
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2TO CAP@TULO 1.- "#u es una %omeose(uen(ia 6%omeobo/8* Un %omeobo/ es una regin altamente (onser0ada $ (onstituida por 1:= nu(letidos! nu(letidos! 'ue se en(uentra en numerosos genes (on a(ti0idad mor,ogni(a. Los produ(tos de los genes (on %omeobo/ a(t;an (omo ,a(tores de trans(rip(in. +.- en(iona un ,a(tor de trans(rip(in Pa/ .- "Dnde se lo(ali)a en la (lula el re(eptor de (ido retinoi(o* A di,eren(ia de mu(%os otros re(eptores! los del (ido retinoi(o 6 α , βy γ ¿ ! se lo(ali)an en el n;(leo. 2.- "La muta(in de 'ue re(eptor (ausa el (ar(inoma baso(elular (utneo* Pat(%ed. 3.- "Cul "Cul es la (lase (lase de mol(u mol(ulas las (u$os (u$os miemb miembros ros se muest muestran ran de ,orma ,orma (ara( (ara(ter terís ísti( ti(aa disposi(iones en dedo )in( o en %li(e-la)o-%li(e* Los ,a(tores de trans(rip(in. trans(rip(in. 5.- >eg;n el (ono(imiento del le(tor a(er(a de los grupos parlogos "Cul de los genes siguientes tiene una e/presin ms anterior en el embrin* ?o/b-1. 9.- "En 'u (entro seali)ador se produ(e >oni( %edge%og* En la noto(orda! en los e/tremos intestinales! en la pla(a del suelo del tubo neural $ en la )ona de a(ti0idad de polari)a(in en el esbo)o de los miembros.
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3TO CAP@TULO 1.- El indu(tor prin(ipal en la indu((in neuronal primaria es El pro(eso noto(ordal. +.- "Cul de los te&idos siguientes se origina a partir de las (lulas 'ue atra0iesan la línea primiti0a* El endodermo embrionario. .- "Cul es la (apa germinati0a (u$as (lulas no estn presentes en la membrana bu(o,aríngea* El mesodermo. 2.- La pla(a pre(ordal desempea un papel importante en la distribu(in regional de El prosen(,alo. 3.- La bra'uiuria! es una (aren(ia de los te&idos (audales del (uerpo! se debe a la muta(in del gen T. 5.- "Cul es la (apa el embrin en ,ase de dis(o bilaminar 6de dos (apas8 'ue origina todo el te&ido embrionario propiamente di(%o* El epiblasto. 9.- "#u importan(ia tiene el ndulo primiti0o en el desarrollo embrionario* El ndulo primiti0o a(t;a (omo organi)ador del embrin. A tra0s del mismo pasan las (lulas 'ue (onstitu$en a la noto(orda. Fsta indu(e la ,orma(in del sistema ner0ioso. El ndulo primiti0o tambin es la estru(tura donde tiene lugar la síntesis de mol(ulas (on a(ti0idad mor,ogni(a! (omo el (ido retinoi(o. Cuando se in&erta un ndulo primiti0o a otro
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Las mol(ulas de ad%esin se pierden en la ,ase de migra(in. Cuando las (lulas migratorias se estable(en! pueden 0ol0er a e/presar di(%as mol(ulas de ad%esin.
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5TO CAP@TULO 1.- El es(lerotomo se origina a partir de (lulas lo(ali)adas en El mesodermo paraa/ial. +.- La pla(a (ardiogni(a se origina a partir El mesodermo espl(ni(o. .- "#u estru(tura produ(e un estímulo de la indu((in 'ue poten(ia la ,orma(in del es(lerotomo epitelial en mesn'uima se(undario* La noto(orda. 2.- "Cul de las estru(turas embrionarias siguientes no est segmentada* La noto(orda. 3.- El mesodermo intermedio es pre(ursor de El sistema urogenital. 5.- "#u ,uer)as estn impli(adas en el plegamiento de la pla(a neural para ,ormar el tubo neural* Una modi,i(a(in de la (on,igura(in (elular en el punto bisagra medial $ las presiones del e(todermo lateral 'ue empu&an las paredes laterales de la pla(a neural. 9.- "#u ,un(in desempean los neurmeros en la ,orma(in del sistema ner0ioso (entral* Los neurmeros propor(ionan la organi)a(in ,undamental ,undamental de las partes del en(,alo en las 'ue 'ue estn estn prese presente ntes. s. Alguno Algunoss genes genes (on (on %omeo %omeobo bo// se e/pre e/presa sann en una se(ue se(uen(i n(iaa estable(ida a lo largo de los neurmeros.
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9O CAP@TULO 1.- En la pla(enta madura "#u te&ido ,etal estable(e dire(tamente una inter,ase (on el te&ido (on&unti0o uterino de la madre* El (itotro,oblasto. (itotro,oblasto. +.- en(iona un trastorno tr astorno rela(ionado (on la impronta paterna La mola %idatidi,orme. .- "Cul es la estru(tura (u$os 0asos sanguíneos al(an)an el (omponente ,etal de la pla(enta* El alantoides. 2.- "#u tipos de (lulas in,iltran las arterias espirales maternas $ redu(en el ,lu&o sanguíneo en sus e/tremos abiertos* El (itotro,oblasto. (itotro,oblasto. 3.- "#u trastorno de membranas e/traembrionarias se puede en(ontrar en un ;tero de gemelos idnti(as* Pla(enta $ membrana amniti(a (omunes. Pla(enta $ (orion (omunes! (on amnios separados. Pla(entas $ membranas e/traembrionarias separadas. Pla(enta (om;n! ,usin par(ial del (orion. 5.- El segundo %i&o de una mu&er de +: aos R% negati0a na(e (on i(teri(ia gra0e "Cul de las siguientes (ara(terísti(as (ara(terísti(as se puede atribuir (on ma$or probabilidad probabilidad a su primer %i&o* R% positi0o.
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<.- "#u %ormona embrionaria %a (onstruido el ,undamento de mu(%as pruebas de embara)o*"Por embara)o*"Por 'u* onadotropina (orini(a %umana. Fsta es la primera %ormona embrionaria di,eren(iada produ(ida por los te&idos tro,oblsti(os. Las primeras pruebas del embara)o utili)adas (onsistían en la in$e((in de (antidades pe'ueas de orina de la mu&er en un e&emplar %embra de sapo (on garras a,ri(ano 6 Xenopus laevis). >i la mu&er estaba embara)ada! la gonadotropina (orini(a 'ue (ontenía su orina estimulaba al sapo a poner %ue0os al día siguiente. Las pruebas a(tuales de embara)o! 'ue se pueden reali)ar media dispositi0os sen(illos 'ue se 0enden sin re(eta! o,re(en (asi resultados instantneos. 1=.- "Por'u una mu&er embara)ada debe tener mu(%o (uidado (on lo 'ue (ome $ bebe* En la a(tualidad se sabe 'ue mu(%as sustan(ias 'ue pasan a la sangre de la mu&er (ru)an la barrera barrera pla(enta pla(entaria! ria! (omo (omo su(ede su(ede (on el al(o%ol! al(o%ol! mu(%os mu(%os ,rma(os ,rma(os $ drogas! drogas! %ormonas esteroideas $ otras sustan(ias de peso mole(ular ba&o. En general! se debe asumir 'ue las mol(ulas (on un peso mole(ular in,erior a 3.=== daltons (ru)an la barrera pla(entaria sin mu(%a di,i(ultad.
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:HO CAP@TULO 1.- La ,o(omelia es ms probable tras la e/posi(in materna a alg;n agente teratgeno durante el primer trimestre de gesta(in! "De (ul se trata* La talidomida. +.- "Cul mal,orma(in se puede atribuir a una altera(in en la reabsor(in tisular* La atresia anal. .- "#u ,a(tor es responsable de un alto por(enta&e de altera(iones (ongnitas* 7a(tores des(ono(idos. 2.- "#u (lase de mal,orma(iones se (onsideran en la a(tualidad produ(idas prin(ipalmente por la de,i(ien(ia de (ido ,li(o* Los de,e(tos del tubo neural. 3.- La ,isura palatina es (onse(uen(ia de un de,e(to en un me(anismo de desarrollo "De (ul se trata*
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Aun'ue puede %aber alguna (one/in (one/in entre el ,rma(o $ la mal,orma(in (ongnita! es mu$ di,í(il demostrar una (one/in entre (ual'uier (aso (on(reto $ un ,rma(o espe(í,i(o! espe(ialmente si ste es re(iente. ?a$ 'ue in0estigar el (onte/to genti(o de la mu&er! otros ,rma ,rma(o (oss 'ue puede puede %aber %aber tomad tomadoo duran durante te el mismo mismo perio periodo! do! sus sus ante(e ante(eden dentes tes de en,ermedades en,ermedades en las primeras etapas etapas de gesta(in $ su estado estado nutri(ional. nutri(ional. In(luso en la me&or me&ores es (ir(un (ir(unsta stan( n(ias ias!! mu(% mu(%as as 0e(es 0e(es slo slo se pued puedee estim estimar ar la proba probabil bilida idadd de una una mal,orma(in (ongnita determinada se deba a un ,a(tor en (on(reto. <.- "Cul es la (ausa ms probable de un tobillo (on una lu/a(in gra0e en un re(in na(ido* Una Una (ausa (ausa ,re(u ,re(uen ente te de estas estas mal,or mal,orma( ma(ion iones es es la de,i(i de,i(ien( en(ia ia de lí'uid lí'uidoo amni amniti( ti(oo 6oligo%idramnios8! 'ue puede poner a las partes e/puestas al ,eto a una presin e/(esi0a e&er(ida por la pared uterina! (on apari(in de de,orma(iones de este tipo. 1=.- Un nio de aos es mu(%o ms pe'ueo de lo normal! muestra una (antidad de pelo es(asa $ tiene dientes irregulares. "Cul es la (ausa ms probable de esta (onstela(in de de,e(tos* Las displasia de los deri0ados e(todrmi(os es la (ausa ms probable.
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<O CAP@TULO 1.- "En (ul de las siguientes (ir(unstan(ias se a(ti0an las (lulas satlite del m;s(ulo* Cre(imiento normal de las ,ibras mus(ulares! mus(ulares! regenera(in de ,ibras mus(ulares e %ipertro,ia de ,ibras mus(ulares. +.- "#u (omponente (elular de la epidermis (onstitu$e un puesto peri,ri(o del sistema inmunitario! (on ,un(iones de presenta(in de antígenos a otras (lulas inmunitarias* Las (lulas de Langer%ans. .- "#u estru(tura tiene un origen mesodrmi(o* El m;s(ulo piloere(tor. 2.- La (raneosinostosis est (ausada por una anomalía en el pro(eso de desarrollo de Las suturas (raneales. 3.- "#u ,a(tor regulador migeno se e/presa el ;ltimo en el desarrollo de una ,ibra mus(ular*
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En el embrin &o0en! el te&ido (erebral indu(e la ,orma(in de los elementos es'uelti(os membra membrano nosos sos (ir(u (ir(unda ndante ntes. s. Cuand Cuandoo ,alta ,alta una una regi reginn (ereb (erebral ral signi signi,i( ,i(ati ati0a 0a no se produ( produ(ee la intera((in indu(ti0a. 1=.- "Cmo se %a determinado 'ue la mus(ulatura de las e/tremidades pro(ede de los somitos* En los e/perimentos (on el uso de mar(ador nu(lear de (odorni) se in&ertaron somitos de este animal en el lugar de los somitos originales en embriones de pollo. Todos Todos los m;s(ulos de los miembros en desarrollo (ontenían n;(leos de (odorni) $ no de pollo.
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1=O CAP@TULO 1.- "Cul de las siguientes mol(ulas e&er(e un papel signi,i(ati0o en la determina(in del e&e dorso0entral dorso0entral del miembro en desarrollo* Jnt-9a +.- "#u mol(ula se aso(ia a la migra(in de (lulas migenas desde los somitos a la $ema del miembro* Pa/- .- "Cul es la ,un(in prin(ipal de la CEA* Estimular el (re(imiento de la $ema del miembro 2.- En el miembro en desarrollo! el produ(to gni(o >oni( %edge%og 6>%%8 se origina en la4 BAP 3.- El te&ido (on&unti0o del miembro deri0a de El mesodermo lateral
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1=.- Un nio na(e (on membranas entre los dedos 6sinda(tilia8. "Cul es la (ausa de esta anomalía* Es probable 'ue la (ausa inmediata sea la ausen(ia de muerte (elular programada en el mesodermo interdigital! pero el moti0o de esta altera(in de la muerte (elular toda0ía no se (ono(e.
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11ERO CAP@TULO 1.- "#u mol(ula produ(ida por la noto(ordaes ,undamental ,undamental para indu(ir la pla(a del suelo del tubo neural* >%%. +.- Los somas (elulares de las motoneuronas de un ner0io ra'uídeo se originan en La pla(a basal. .- Un nio (on un me(%n me(%n de pelos en la regin lumbar lumbar de la (olumna (olumna 0ertebral 0ertebral se sometea sometea una inter0en(in 'uir;rgi(a por una altera(in (ongnita en esta regin. Durante la (irugía se en(uentra 'ue la duramadre $ la ara(noides 'ue re0isten la mdula espinal estn (ompletas! pero 'ue ,altan
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1=.- "Cul es el aspe(to probable de la mdula espinal $ los ner0ios bra'uiales en un la(tante 'ue %a na(ido (on una agenesia (ongnita de un bra)o 6Amelia8* Los ner0ios serian %ipoplsi(os 6u(%o ms pe'ueos de lo normal8 $ la medula espinal seria ms delgada de lo %abitual en la )ona donde se originan los ner0ios (orrespondientes al miembro a,e(tado. La (ausa ms probable es el e/(eso de muerte (elular neuronal por la ausen(ia de un rgano diana al 'ue puedan llegar los numerosos a/ones 'ue iner0an normalmente el miembro.
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1+DO CAP@TULO 1.- "#u mol(ula es un mal sustrato para las (lulas de la (resta neural en migra(in* El sul,ato de (ondroitina. +.- Las (lulas de la (resta neural se originan en El tubo neural. .- Un la(tante de 5 meses de edad muestra m;ltiples mal,orma(iones (ongnitas! (omo paladar %endido! sordera! %ipertelorismo o(ular $ un me(%n blan(oen la parte anterior del pelo! siendo el resto negro. El diagnsti(o probable es
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neural del tron(o 6P. E&.! los ni0eles (rneo (audales estn espe(i,i(ados en las (lulas de la primera! mientras 'ue no lo estn en las de la segunda8. Las (lulas de la (resta neural (raneal ,orman una gran parte de la dermis $ de otros te&idos (on&unti0os! no así las de la (resta neural del tron(o.
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1ER CAP@TULO 1.- "*
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+.- "*
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.- "*
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2.- "*
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3.- "*
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