File:Stage8 sem6.jpg

From Embryology

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Human Embryo Stage 8

  • Carnegie stage 8, day 18
  • Scanning EM dorsal view (cut amnion) showing detailed view of the prechordal region.
  • The mesoderm in this region will give rise to the embryonic heart tube.
  • Selected region from the image selected rostral (cranial) region, which is in turn the rostral region of the entire embryonic disc image.
  • Note the rostro-caudal axis (top to bottom), the growing brain region of the neural plate (top) and shape of the folding embryonic disc.
  • Note the cut edge of amniotic sac with two layers (upper ectoderm, lower extra-embryonic mesoderm)


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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current10:36, 22 August 2009Thumbnail for version as of 10:36, 22 August 20091,000 × 698 (87 KB)S8600021 (talk | contribs)Human embryo (Stage 8, day 18) Scanning EM dorsal view (cut amnion) showing detailed view of the prechordal region. Note the rostro-caudal axis (top to bottom), the growing brain region of the neural plate (top) and shape of the folding embryonic disc.