Multiple choice

Mammalian embryo is directly surrounded by

  1. amniotic cavity

  2. allantoic cavity

  3. primary digestive cavity

  4. yolk sac cavity
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A Correct answer
Explanation

The amniotic cavity is the closed sac between the embryo and the amnion, containing the amniotic fluid. The amniotic cavity is formed by the fusion of the parts of the amniotic fold, which first makes its appearance at the cephalic extremity and subsequently at the caudal end and sides of the embryo.

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