Development Animation - Week 3: Difference between revisions

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* <font color=lightskyblue>'''blue'''</font> - epiblast layer of amniotic cavity
* <font color=lightskyblue>'''blue'''</font> - epiblast layer of amniotic cavity
* yellow - endoderm layer of the yolk sac and gastrointestinal tract
* <font color=gold>'''yellow'''</font> - endoderm layer of the yolk sac and gastrointestinal tract
* red - outside embryo extraembryonic mesoderm and inside embryo mesoderm
* <font color=tomato>'''red'''</font> - outside embryo extraembryonic mesoderm and inside embryo mesoderm
 


Compare this sectional view of folding with the [[Development Animation - Amniotic Cavity|Amniotic Cavity]] view, filling the amnion and yolk cavities.
Compare this sectional view of folding with the [[Development Animation - Amniotic Cavity|Amniotic Cavity]] view, filling the amnion and yolk cavities.
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[[File:Amnion 001 icon.jpg|90px|link=Development Animation - Amniotic Cavity]]
[[File:Amnion 001 icon.jpg|90px|link=Development Animation - Amniotic Cavity]]


:'''Links:''' [[Media:Week3_folding.mov|Quicktime]] | [[Quicktime Development Animation - Week 3|Quicktime version]] | [[Development Animation - Week 3|Flash version]]
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[[Category:Week 3]]

Latest revision as of 16:24, 2 March 2013

Embryology - 28 Mar 2024    Facebook link Pinterest link Twitter link  Expand to Translate  
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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

  1. brings the cardiac region and allantois ventrally
  2. brings the buccopharyngeal membrane, cloacal membrane and connecting stalk ventrally
  3. encloses the embryo in amniotic cavity
  4. 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.

Amnion 001 icon.jpg