File:Placental membranes.jpg

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Embryo with Placental Membranes

By the external appearance of the embryo appears to be about Week 7 (GA week 9) either Carnegie stage 18 or Carnegie stage 19

amniotic sac - formed by the amniotic membrane (ectoderm and extra-embryonic mesoderm) completely surrounding the surrounding the embryo.
yolk sac - the yolk membrane (endoderm and extra-embryonic mesoderm) attached to the embryo at the umbilicus and continuous with the midgut.
chorionic cavity - membrane (extra-embryonic mesoderm) has been removed but is represented by the black space outside the amniotic and yolk sac and part of the remaining chorionic villi region.

Links: Week 7 | Carnegie stage 18 | Carnegie stage 19 | Placenta - Membranes | Placenta Development

Image Source: UNSW Embryology, no reproduction without permission.

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

Cite this page: Hill, M.A. (2024, April 26) Embryology Placental membranes.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Placental_membranes.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	23:36, 16 August 2009		600 × 450 (99 KB)	S8600021 (talk \| contribs)	Image Source: UNSW Embryology, no reproduction without permission. PlMembraneW600.jpg http://embryology.med.unsw.edu.au/Notes/images/placenta/plMembraneW600.jpg

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