File:Stage7 mesoderm.jpg
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Human Embryo Carnegie Stages 7
Showing in overlay the 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. Stage 7 Labelled | Stage 7 Molecular | Stage 7 SEM | Stage 8 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. |
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Reference
Image Source: UNSW Embryology
No image reuse without permission.
Cite this page: Hill, M.A. (2024, March 19) Embryology Stage7 mesoderm.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Stage7_mesoderm.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 12:12, 10 August 2009 | 690 × 800 (67 KB) | MarkHill (talk | contribs) | Carnegie Stages 7 showing mesoderm region of 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 |
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