File:Stage7 axial process.jpg: Difference between revisions

Latest revision as of 16:57, 4 April 2012

Human Embryo - Carnegie Stage 7

Features: embryonic disc, primitive node, primative streak, primitive 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.

Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline

Image source: The Kyoto Collection images are reproduced with the permission of Prof. Kohei Shiota and Prof. Shigehito Yamada, Anatomy and Developmental Biology, Kyoto University Graduate School of Medicine, Kyoto, Japan for educational purposes only and cannot be reproduced electronically or in writing without permission.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	14:56, 3 August 2009		500 × 375 (11 KB)	MarkHill (talk \| contribs)	Carnegie Stages 7 showing direction of axial process extension from primitive node. Features: embryonic disc, primitive node, primative streak, primitive groove, yolk sac Facts: Week 3, 15 - 17 days, 0.4 mm View 1: embryonic disc, showing the epiblast

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@@ Line 1: / Line 1: @@
-Carnegie Stages 7 showing direction of axial process extension from primitive node.
+==Human Embryo - Carnegie Stage 7==
 Features: embryonic disc, primitive node, primative streak, primitive groove, yolk sac
@@ Line 7: / Line 7: @@
 View 1: embryonic disc, showing the epiblast viewed from the amniotic (dorsal) side.
-Events: 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, and finally the notochord.
+Events: Gastrulation is continuing as cells migrate from the epiblast, continuing to form mesoderm.
-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.
+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.
-Original file name: Stage7n3.jpg
-'''Image Source:''' UNSW Embryology, no reproduction without permission. [http://embryology.med.unsw.edu.au/wwwhuman/Stages/stage7.htm UNSW Embryology Carnegie Stage 7]
+{{Kyoto7}}
-[[Category:Human Embryo]] [[Category:Carnegie Stage]] [[Category:Week 3]]
+{{Carnegie stages}}
+{{Template:Kyoto collection}}
+[[Category:Human Embryo]] [[Category:Carnegie Stage]] [[Category:Carnegie Stage 7]] [[Category:Week 3]] [[Category:Notochord]]