File:Stage9 bf2-primordial germ cell region.jpg

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Human Embryo (stage 9)

Carnegie Stage 9, week 3, day 20, somites 3-4

Ventrolateral view (cut away from chorion and amniotic sac) showing the embryo and yolk sac.

Green highlighted region shows the hind gut-yolk sac junctional region where primordial germ cells are thought to initially reside before migrating into the genital ridge.

Note also:

  1. the relative size of the embryo and the associated extra-embryonic coeloms.
  2. the shape of the early folded embryonic disc and rostro-caudal bendings.
  3. the relative thicknesses of the embryo and extra-embryonic membranes.
  4. the position of the prechordal plate (cardiogenic region) ventral to brain fold.


Page Links: Carnegie stage 9 | Week 3 | Primordial Germ Cell Development | Gastrulation


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: 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, May 24) Embryology Stage9 bf2-primordial germ cell region.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Stage9_bf2-primordial_germ_cell_region.jpg

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


Original file name: Stage9day20somites3-4lateralbf2v2.jpg

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current13:49, 29 May 2011Thumbnail for version as of 13:49, 29 May 2011814 × 1,000 (72 KB)S8600021 (talk | contribs)== Human Embryo (stage 9)== Stage 9, week 3, day 20, somites 3-4 Ventrolateral view (cut away from chorion and amniotic sac) showing the embryo and yolk sac. Note: # the relative size of the embryo and the associated extra-embryonic coeloms. # the sh