Week 3 Development Movie: Difference between revisions

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Embryology - 16 Apr 2024 Expand to Translate
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<html5media height="540" width="390">File:Week3_folding.mp4</html5media>

Click Here to play on mobile device

Embryo Folding

This animation shows 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 - epiblast layer of amniotic cavity
yellow - endoderm layer of the yolk sac and gastrointestinal tract
red - outside embryo extraembryonic mesoderm and inside embryo mesoderm

Links: MP4 version | Week 3 | Movies

‎‎Amniotic Cavity

Page | Play

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

Glossary Links: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Movies

Cite this page: Hill, M.A. (2024, April 16) Embryology Week 3 Development Movie. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Week_3_Development_Movie

What Links Here?

@@ Line 14: / Line 14: @@
 Folding of the embryonic disc
-# brings the cardiac region and [[A#allantois|allantois]] ventrally
+# brings the cardiac region and {{allantois}} ventrally
 # brings the [[B#buccopharyngeal membrane|buccopharyngeal membrane]], [[C#cloacal membrane|cloacal membrane]] and connecting stalk ventrally
 # encloses the embryo in amniotic cavity