Development Animation - Week 3: Difference between revisions

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Week 3 Development Movie

Embryology - 19 Apr 2024 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

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.

@@ Line 1: / Line 1: @@
+#REDIRECT [[Week 3 Development Movie]]
+{{Movie header}}
 {|
 |-
-|<wikiflv height=width="268" height="264" autoplay="true">Amnion 001.flv|Amnion 001_icon.jpg</wikiflv>
+|<wikiflv width="388" height="500" autoplay="true">Week3_folding.flv|Week3_folding icon.jpg</wikiflv>
-| This animation shows the development of the extraembryonic coeloms. Note that as the yolk sac (yellow) is continuous with the midgut you can also follow development of the gastrointestinal tract regions of foregut, midgut and hindgut.
+| This animation shows folding of the embryonic disc beginning week 3 of development.
-Embryo is shown to the left and the placenta 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.
-* yellow - outside embryo [[Y#yolk sac|yolk sac]] (circular balloon) and inside embryo gastrointestinal tract regions (foregut, midgut and hindgut)
+Note also the early cardiac region shown at the cranial end of disc and the [[A#allantois|allantois]] at the caudal end of disc extending into the [[C#connecting stalk|connecting stalk]].
-* blue - [[A#amniotic cavity|amniotic cavity]]
-* white - [[C#chorionic cavity|chorionic cavity]] surrounding amnion and yolk sac
+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 [[Y#yolk stalk|yolk stalk]] or [[V#vitelline duct|vitelline duct]]
-[[Media:Amnion_001.mov|Quicktime version]]
+* <font color=lightskyblue>'''blue'''</font> - epiblast layer of amniotic cavity
-|-
+* <font color=gold>'''yellow'''</font> - endoderm layer of the yolk sac and gastrointestinal tract
-|}
+* <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.
+[[File:Amnion 001 icon.jpg|90px|link=Development Animation - Amniotic Cavity]]
-:[[Media:Week3_folding.mov|Quicktime version]]
+|-
+|}
-{{Template:DevCartoon}}
-[[Category:Week 3]]