Developmental Anatomy

Stage 8: Lab Manual - Horizon 8

First view Second view

Stage 8 Stereo Views

  • Length: 1 - 1.5 mm.
  • Hensons node and primary groove.
  • The curved germ disc lies between a yolk sac with blood islands and a crescent shaped amniotic cavity.
  • The body stalk bends back and blends with the chronic mesoblast.
  • Ovulation age: 17 - 19 days.

Stage 8: Animation

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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 8 (PDF 764 KB)


QUESTION: What occurs to the body stalk?