What Is Required For The Formation Of Placenta?

Development of the placenta begins when the blastocyst implants into the endometrium. The trophoblast forms from the outer layer of the blastocyst. This later forms the outer layer of the placenta.

In other words, the 32-64 cell blastocyst has two separate differentiated embryonic cell types – inner cell mass and outer trophoblast cells. These trophoblast cells go on to form placenta. The inner cell mass forms the fetus and fetal membranes.

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