File:Stage9 sem5b.jpg

From Embryology
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Human embryo

Stage 9 day 20, somites 3-4

Cranial view (amniotic sac cut away) showing the embryo, cut amnion and yolk edge.

Note:

  1. the shape of the early folded embryonic disc and rostro-caudal bendings.
  2. the large neural groove.
  3. the brain folds.
  4. the stomedeal/buccopharyngeal region.
  5. the ventral cardiogenic region.

Original file name: stage9day20somites3-4rostrodorsalsem5v2.jpg

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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