File:Stage7 notochord.jpg: Difference between revisions

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Carnegie Stage 7 showing the notochord or axial mesoderm region of the embryonic disc

Features: embryonic disc, primitive node, primative streak, primative groove, yolk sac

Facts: Week 3, 15 - 17 days, 0.4 mm

View 1: embryonic disc, showing the epiblast viewed from the amniotic (dorsal) side.

Events: Gastrulation is continuing as cells migrate from the epiblast, continuing to form mesoderm.

Mesoderm lies between the ectoderm and endoderm as a continuous sheet except at the buccopharyngeal and cloacal membranes.
These membranes have ectoderm and endoderm only and will lie at the rostral (head) and caudal (tail) of the gastrointestinal tract.
From the primitive node a tube extends under the ectoderm in the opposite direction to the primitive streak.
This tube forms first the axial process then notochordal process, then finally the notochord.

The notochord is a key to embryonic folding and regulation of ectoderm and mesoderm differentiation. It lies in the rostrocordal axis and the embryonic disc will fold either side ventrally, pinching off a portion of the yolk sac to form the lining of the gastrointestinal tract.

Stage 7 Mesoderm: axial | paraxial | intermediate | lateral plate

Image Source: UNSW Embryology http://embryology.med.unsw.edu.au/wwwhuman/Stages/stage7.htm

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	11:21, 10 August 2009		690 × 800 (70 KB)	MarkHill (talk \| contribs)	Carnegie Stages 7 showing the notochord or axial mesoderm region of the embryonic disc. Features: embryonic disc, primitive node, primative streak, primative groove, yolk sac Facts: Week 3, 15 - 17 days, 0.4 mm View 1: embryonic disc, showing the epibl

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@@ Line 1: / Line 1: @@
-Carnegie Stages 7 showing the notochord or axial mesoderm region of the embryonic disc.
+==Carnegie Stage 7 showing the notochord or axial mesoderm region of the embryonic disc==
 Features: embryonic disc, primitive node, primative streak, primative groove, yolk sac
@@ Line 9: / Line 9: @@
 Events: Gastrulation is continuing as cells migrate from the epiblast, continuing to form mesoderm.
-Mesoderm lies between the ectoderm and endoderm as a continuous sheet except at the buccopharyngeal and cloacal membranes. These membranes have ectoderm and endoderm only and will lie at the rostral (head) and caudal (tail) of the gastrointestinal tract.
+* Mesoderm lies between the ectoderm and endoderm as a continuous sheet except at the [[B#buccopharyngeal membrane|buccopharyngeal]] and [[C#cloacal membrane|cloacal]] membranes.
+* These membranes have ectoderm and endoderm only and will lie at the rostral (head) and caudal (tail) of the gastrointestinal tract.
+* From the primitive node a tube extends under the ectoderm in the opposite direction to the primitive streak.
+* This tube forms first the axial process then notochordal process, then finally the notochord.
+The notochord is a key to embryonic folding and regulation of ectoderm and mesoderm differentiation. It lies in the rostrocordal axis and the embryonic disc will fold either side ventrally, pinching off a portion of the yolk sac to form the lining of the gastrointestinal tract.
+:{{Stage 7 overlays}}
-From the primitive node a tube extends under the ectoderm in the opposite direction to the primitive streak. This tube forms first the axial process then notochordal process, then finally the notochord.
-The notochord is a key to embryonic folding and regulation of ectoderm and mesoderm differentiation. It lies in the rostrocordal axis and the embryonic disc will fold either side ventrally, pinching off a portion of the yolk sac to form the lining of the gastrointestinal tract.
 Image Source: UNSW Embryology http://embryology.med.unsw.edu.au/wwwhuman/Stages/stage7.htm