File:Stage9 sem1.jpg

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Human embryo

Stage 9, day 20, somites 3-4

Scanning EM lateral view (cut away from amniotic sac) showing the embryo and connecting stalk.

Note:

  1. the relative size of the embryo.
  2. the shape of the early folded embryonic disc and rostro-caudal bendings.
  3. the size and shape of the brain fold region.
  4. the primitive node and streak (left) beside connecting stalk.
  5. the position of the prechordal plate (cardiogenic region) ventral to brain fold.

Original file name: Stage9day20somites3-4lateralsem1-1000px.jpg

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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

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

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current12:25, 22 August 2009Thumbnail for version as of 12:25, 22 August 20091,000 × 627 (80 KB)S8600021 (talk | contribs)Human embryo Stage 9 day 20, somites 3-4 Scanning EM lateral view (cut away from amniotic sac and yolk sac) showing the embryo and connecting stalk. Note: # the relative size of the embryo. # the shape of the early folded embryonic disc and rostro-cau