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Human Embryo SEM (Carnegie stage 10)

Carnegie stage 10, Week 3 (21 days, 4 somite pairs) GA week 5. Scanning elector micrograph of the embryo ventral view. Ventral body wall and yolk sac have been removed.

neural plate open and lying above the buccopharyngeal membrane. The edges of the plate will come together and fuse leaving initially the cranial neuropore and when this closes the neural tube. Primitive heart tube exposed by removal of ventral body wall. The space surrounding the tube os the pericardial cavity. The foregut lies behind the heart tube and is not visible. Midgut connection to the yolk sac. The ventral body wall and yolk sac have been removed, exposing the large opening (connection) of the two structures at this stage. The lining of the midgut is endoderm covered in a layer of splanchnic mesoderm. Note that with continued folding this open connection is reduced to a narrow yolk stalk (vitelline duct or omphalomesenteric duct). Connecting stalk ventrally connects the embryo to the chorionic wall. Within it will lie the placental vessels and allantois. The hindgut lies behind this structure inside the embryo and along with the cloacal membrane is not visible in this image.



Stage 10 Links: Week 4 | Gastrulation | Lecture | Practical | Image Gallery | Carnegie Embryos | Embryos | Category:Carnegie Stage 10 | Next Stage 11
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Image Source: Scanning electron micrographs of the Carnegie stages of the early human embryos are reproduced with the permission of Prof Kathy Sulik, from embryos collected by Dr. Vekemans and Tania Attié-Bitach. Images are for educational purposes only and cannot be reproduced electronically or in writing without permission.

Embryonic Development


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Cite this page: Hill, M.A. (2024, June 25) Embryology Stage10 sem1.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Stage10_sem1.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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