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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- Embryo development
- What is placenta?
- Which Hormone Is Necessary For Formation Of Placenta?
- Does Trophoblast Become Placenta?
- How Does The Placenta Form During Pregnancy?