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Developmental Anatomy

Stage 12: Lab Manual - Horizon 12 (7852 and 5923)

First view Second view

  • Length: 3- 5 mm.
  • The embryo has 3 branchial bars in this stage.
  • The ear vesicles are almost closed but not detached.
  • The arm buds is just beginning to appear.
  • The intestinal portal can be seen well.
  • Ovulation age: 26 - 30 days.

Stage 12: 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 12 (PDF 952 KB)

 

QUESTION: How many branchial bars does the embryo have in this stage?