File:Placental membranes.jpg

From Embryology
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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, labeled with placental vessels.


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. (2019, March 21) Embryology Placental membranes.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Placental_membranes.jpg

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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