33 Hour Chick Embryo Transverse Section

33 hour Chick

Subcephalic Pocket Prosencephalon

Prosocoel

Yolk Sac Amniotic Fold

1

Extra Embryonic Coelom

Subcephalic Pocket Proamnion Prosocoel

Prosencephalon

1

Mesenchyme

Prosencephalon

Area Pellucida

Head Ectoderm Optic Vessel

Yolk Sac Extra Embryonic Coelom Amniotic Fold

2

Area Vasculosa

Prosocoel Neural Crest Cells

Head Ectoderm Mesenchyme

Subcephalic Pocket

Optic Vessel Proamnion

Lens Placode

2

Yolk Sac

Optic Vessel Prosocoel

Prosencephalon Infundibulum Head Ectoderm Mesenchyme

Amniotic Fold Yolk Sac

Extra Embryonic Coelom

3

Prosencephalon Infundibulum

Prosocoel

Optic Vessel Head Ectoderm

Mesenchyme 3

Head Ectoderm

Mesenchyme

Optic Vessel

Amniotic Fold Lens Placode

Yolk Sac

3

Amniotic Fold

Extra Embryonic Coelom

Yolk Sac

Area Opaca Vasculosa

3

Notochord

Stomodeum

Mesencephalon Mesocoel

Dorsal Aorta

Foregut/ Pharynx Ventral Aorta

First Aortic Arch Subcephalic Pocket

4

Mesencephalon Notochord Pharynx

Mesocoel

Stomodeum

Ventral Aorta

First Aortic Arch Dorsal Aorta

4

Notochord

Rhombencephalon Rhombocoel

4.5

Bulbus cordis

Notochord

Rhombencephalon

Ventral Aorta Pharynx

Rhombocoel Isthmus

Bulbus Cordis

Dorsal Aorta

First Aortic Arch

4.5

Rhombencephalon

Bulbus Cordis

Rhombocoel Pericardial Coelom

5

Dorsal Mesocardium/ Isthmus Rhombocoel

Endocardium

Epimyocardium

Dorsal Aorta

Aortic Arch

5

Rhombencephalon

Rhombocoel Auditory pit/ placode

Thyroid Ventricle

Pericardial Cavity

6

Rhombencephalon

Notochord

Rhombocoel

Thyroid

Neural crest cells

Dorsal Aorta

First Aortic arch 6

Notochord Thyroid

Splanchnic Mesoderm Endoderm

Dorsal Aorta Ventricle

Mesenchyme

Auditory Placodes

Endocardium Aortic Arch Epimyocardium Ectoderm

Somatic Mesoderm

6

Rhombencephalon Rhombocoel

Atrium

Endocardium Epimyocardium

6.5

Auditory Placode

6.5

Atrium

Dorsal Mesocardium Ventricle

7

Dorsal Mesocardium

Atrium Notochord

Dorsal Aorta

7

Dorsal Mesocardium

Rhombencephalon

8

Sinus Venosus

Anterior Intestinal Portal Dorsal Aorta Vitelline Vein

9

Vitelline Vein

9

Rhombencephalon Midgut

Vitelline Vein

10

Midgut

Dorsal Aorta Anterior Cardinal Veins

Vitelline Vein

10

Somite Spinal Cord Dorsal Aortae Notochord Mesoderm Ectoderm

11

Notochord Spinal Cord

Neurocoel

Somite

Nephrotome

11

Dorsal Aortae

Somite Nephrotome Hypomere

Splanchnopleure Somatopleure

11

Spinal cord Somite

12

Dorsal Aorta

Neural Tube

Hensen’s Node

Unsegmented Mesoderm

Coelom Omphalomesenteric Vein

13-is this a pit?

*sinus terminalis is bordering the area vasculosa Mesencephalon Rhombencephalon Spinal Cord

Prosencephalon Prosocoel

Nephrotome Sinus Rhomboidalis

Optic Vesicles Proamnion

Somites

Infundibulum

Myelencephalon Metencephalon

Blood Island

Whole mount

Heart

Anterior Intestinal Portal Myelencephalon

Foregut Optic Vesicle

Somite

Metencephalon

Spinal Cord

Prosocoel

Infundibulum

Rhombencephalon Mesencephalon Prosencephalon

Whole mount

Nephrotome

Spinal Cord Notochord?

Somites

Whole mount

Sinus Rhomboidalis

Whole mount