What is the fate of trophoblast in a mammalian embryo?
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Trophoblasts (from Greek trephein: to feed, and blastos: germinator) are cells forming the outer layer of a blastocyst, which provide nutrients to the embryo and develop into a large part of the placenta.
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Explanation:
Trophoblast is the cells that develop at the outer layers of blastocyst during early development of zygote.
Two types of trophoblast are there
- Cytotrophoblast
- Syncitiotrophoblast.
Cytotrophoblast has clear demarcation of its cells. But, Syncitiotrophoblast lacks that. It has many nucleus roaming around inside it.
During development of the zygote, its trophoblast which helps in the adherence of the zygote to uterine endometrium, and thereby penetrate into the uterus to draw nutrition.
Slowly, the trophoblast is replaced by the placenta, which takes the upper hand.
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