Week 3 Development Movie

Embryology - 11 Dec 2023 Expand to Translate
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<html5media height="540" width="390">File:Week3_folding.mp4</html5media>

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Embryo Folding

This animation shows a mid-sagittal section of the folding of the embryonic disc beginning week 3 of development.

Embryo (midline section) shown to the left and early placenta to the right. The embryonic disc dorsal (ectoderm) top and ventral (endoderm) bottom. Cranial end of disc to the left and caudal end of disc to the right.

Note also the early cardiac region shown at the cranial end of disc and the allantois at the caudal end of disc extending into the connecting stalk.

Folding of the embryonic disc

brings the cardiac region and allantois ventrally
brings the buccopharyngeal membrane, cloacal membrane and connecting stalk ventrally
encloses the embryo in amniotic cavity
narrows the connection between yolk sac and midgut of the gastrointestinal tract to a channel, the yolk stalk or vitelline duct

blue - ectoderm layer of embryo and amniotic cavity
yellow - endoderm layer of the yolk sac and gastrointestinal tract
red - mesoderm layer of embryo and extra-embryonic mesoderm outside of embryo.

Links: MP4 version | Week 3 | Movies

‎‎Amniotic Cavity

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Compare this sectional view of folding with the Amniotic Cavity view, filling the amnion and yolk cavities.

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Cite this page: Hill, M.A. (2023, December 11) Embryology Week 3 Development Movie. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Week_3_Development_Movie

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