In the blastocyst,the inner layer forms the amniotic cavity and the outer layer forms the yolk sac.

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In the blastocyst, the inner cell mass (embryoblast) gives rise to the embryo and eventually forms the amniotic cavity, while the outer layer, known as the trophoblast, contributes to the formation of the placenta and is not directly involved in forming the yolk sac. The yolk sac is derived from hypoblast cells which originate from the embryoblast.

In the Blastocyst,the Inner Layer Forms the Amniotic Cavity and the Outer