Q:

Which of the following does not pass through the primitive umbilical ring?

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Which of the following does not pass through the primitive umbilical ring?


  1. Allantois
  2. Amnion
  3. Yolk sac
  4. Connecting stalk
  5. Space connecting the intraembryonic and extraembryonic coeloms

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B. The amnion does not pass through the primitive umbilical ring. As craniocaudal folding occurs, the amnion becomes the outer covering of the umbilical cord.

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