Development Animation - Week 3: Difference between revisions

Revision as of 09:49, 16 Mayıs 2010

Week3_folding icon.jpg</wikiflv>

This animation shows folding of the embryonic disc beginning week 3 of development.

Embryonic disc (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

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

Quicktime version

Source: UNSW Embryology Thanks to the late Prof William Larsen for allowing permission to use animations based on images from his textbook. (More? movie technical information)

Links: Movies Page | Category:Movies

Cite this page: Hill, M.A. (2026, October 29) Embryology Development Animation - Week 3. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Development_Animation_-_Week_3

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 |<wikiflv width="388" height="500" autoplay="true">Week3_folding.flv|Week3_folding icon.jpg</wikiflv>
-| This animation shows embryonic disc folding beginning week 3 of development.
+| This animation shows folding of the embryonic disc beginning week 3 of development.
-Embryonic disc (midline section) shown to the left and early placenta to the right.  Cranial end of disc to the left and caudal end of disc to the right.
+Embryonic disc (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 [[A#allantois|allantois]] ventrally
+# brings the [[B#buccopharyngeal membrane|buccopharyngeal membrane]], [[C#cloacal 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