Developmental Anatomy

Stage 6: Lab Manual - Horizon 6

First view Stereo view Second view Stereo view

  • 0.2 mm in size.
  • Implanted Ovum.
  • Primitive unbranched villi.
  • Distinct yolk sac.
  • Germ disc is oval shaped.
  • Axial differentiation is just appearing.
  • Ovulation Age: 13 - 15 days.

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Developmental Stages in Human Embryos by Ronan O'Rahilly and Fabiola Müller.
Published by Carnegie Institution of Washington, Publication 637. 1987.

Stage 6 (PDF 615 KB)


QUESTION: What is the shape of the germ disc in stage six?