As the blastocyst develops,the outer layer cell mass forms the amniotic cavity and the yolk sac.

Name: As the blastocyst develops,the outer layer cell mass forms the amniotic cavity and the yolk sac.
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The outer layer of the blastocyst, known as the trophoblast, develops into the placenta and the membranes that surround the embryo, not directly into the amniotic cavity and the yolk sac. The amniotic cavity and yolk sac are formed from the inner cell mass, not the outer layer.

As the Blastocyst Develops,the Outer Layer Cell Mass Forms the Amniotic