Question

In the mammalian embryo, the first structure to develop relationship with the wall of the uterus is

The amnion

The inner cell mass

Mark for Review

AX

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The allantois

The trophoblast​

Answer 1

Answer:

The trophoblast is the first structure to develop a connection with the uterine endometrium.

Explanation:

The embryo differentiates into trophoblast (which gets interdigitated with the uterine wall to form a placenta) and formative cells/ inner cell mass( which forms the embryo proper).

Amnion and allantois develop later as membranes around the embryo.