early chick embryo
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Early chick embryo
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Whole Mount of Chick Blastoderm
AO = area opaca, AP= area pellucida
P= region of thick
blastoderm thatmarks the futureposterior region of theembryo; area wheregastrulation begins
Arrows= movementof rapidly dividingcells of epiblast layer
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Chick Embryo - Primitive Streak Stage
The primitive streakisthe region where epiblastcells converge (solidarrows) and movethrough a groove into the
blastocoel (dashedarrows). The primitivesteak consists of a lightlystaining groove borderedon each side by darker
staining ridges. Hensen'snode marks the anteriorof the streak and P marksthe posterior.
AO= area opaca,
AP = area pellucida,P= posterior
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Cross sections through Primitive streak
Key to Upper Crosssection:
AO = area opaca
AP= area pellucida
^^= remnants of yolkgranules,
arrows = direction ofingression of embryonic
cells Lower Cross Section
shows the three germlayers formed by theprocess of gastrulation.
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24-hr chick embryo
AIP = anterior
intestinal portal
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Prominent neurocoele (neurocoel)in the
Portions of the notochord arevisible just ventral to the brain andspinal cord.
Foregut (asterisk) is seen as a
cavity extending from the top ofthe head to the anterior intestinalportal.
Between the foregut andsubcephalic pocket is a region ofsplanchnic mesoderm that willform the heart.
Somites are not visible in thissection (the plane of section isbetween the paired rows ofsomites).
A Sagittal Section of a 26 Hour Chick
Embryo
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The 33 Hour Chick Embryo - Whole Mount
AIP = anteriorintestinal portal
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Sagittal Section of a 33 Hour Chick
Embryo
divisions of thedeveloping brain.
neuromeres in therhombencephalon.
Neuromeres aresegmental divisions of thebrain seen in the embryo.
heart forming region isnow seen much moreclearly
portions of the somitesare seen
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Chick embryo 33 hrs serial cross
section
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48 Hour Chick Embryo
Whole Mount
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Details of Head
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48 Hour Chick Embryo
The brain now consists of five parts or"vesicles". The prosencephalon hasdivided into two regions, the telencephalon
and the diencephalon. The region of themesencephalon remains as a single unitand retains its name of mesencephalon.The rhombencephalon has become the
metencephalon and the myelencephalon.Each of these embryonic parts of the brainwill form distinct parts of the adult brain.
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Details of Pharynx
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Details of Heart
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48 Hour Chick
Embryo serial cs
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72 Ho r Chick Embr o
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72 Hour Chick Embryo
Whole Mount
1 = Telencephalon
2 = Diencephalon
3 = Mesencephalon4 = Metencephalon
5 = Myelencephalon
* = Otic capsule
^ = Olfactory pit
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