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Early Development

Stages of the Chick embryo

Whole mount of 16 hour chick embryo

Henson node

Primitive streak

Area pellucida

Area opaca

Embryonic region

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Cross section in 16 hour chick embryo through

hensen node

Cross section in 20 hour chick embryo through

hensen node

Henson node

Henson node

ectodermmesoderm

endoderm

mesodermectoderm

endodermyolk

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Cross section in 22 hour chick embryo shows hensennode

Cross section in 22 hour chick embryo shows neural

plate

Primitive streakectoderm

Migrating cellsEndoderm

Neural plate

endodermnotochordmesoderm

ectoderm

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Cross section in 22 hour chick embryo shows neural

tube

Whole mount of 24 hour chick embryo

Neural tube

proamnion

Head fold

Anterior intestinal

portal

Mesodermal

somites

Primitive knot

Primitive streak

Blood islands

neuropore

Neural fold

Fore gut

notochord

Area pellucida

Area vasculosa

Area vitellina

Area

opaca

coelom

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Vertical section of 24 hour chick embryo

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Cross section in 24 hour chick embryo throughhensen node

Cross section in 24 hour chick embryo shows neural

fold

mesoderm

ectodermArea vasculosa

Primitive streak

Neural fold

Neural groove

ectoderm

notochord

somite

yolk

splanchnic

mesoderm

Somatic

mesoderm

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Cross section in 24 hour chick embryo shows neural

tube

Cross section in 24 hour chick embryo through head

region

Neural tube

mesoderm

splanchnic

mesoderm

Somatic

mesoderm

Fore gutcoelomendoderm

Head foldNeural fold

notochord Fore gut

proamnionSub cephalic pouch

endodermmesoderm

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Whole mount of 48 hour chick embryo

mesencephalon

diencephalon

Optic vesicle

telencephalon

heart

Anterior intestinal portal

Vitelline vien

Tail bud

Head fold

Pharynx pouch

metencephalon

Pharynx

Myelencephalon

Otic vesicle

somites

Pharynx pouch

Neural tube

Tail fold

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verical section of 48 hour chick embryo

telencephalon

diencephalon

mesencephalonmetencephalon

Myelencephalonnotochord

Pharynx

somites

Neural tube

heart

Tail bud

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cross section of 48 hour chick embryo through eye and

pharynx pouchs

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cross section of 48 hour chick embryo through heart

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cross section of 48 hour chick embryo through the

anterior intestinal portal

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cross section of 48 hour chick embryo through trunk

region and lateral body fold

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cross section of 48 hour chick embryo through trunk

region

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Whole mount of 72 hour chick embryo

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cross section of 72 hour chick embryo througheye andheart

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cross section of 72 hour chick embryo through

pharyngeal puoch

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Whole mount of 96 hour chick embryo