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Developmental Anatomy

Stage 7: Lab Manual - Horizon 7

First view Stereo view Second view

Third 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 7 (PDF 434 KB)

 

QUESTION: What is the main characteristic of a stage 7 embryo?