Question

Explain the steps in the formation of chorionic villi

Answer 1

Explanation:

Definition of Chorionic Villi

The chorion is formed by mesoderm tissue from the mother and trophoblast cells derived from the forming fetus. The chorionic villi emerge from this chorion and enter the endometrium. ... Embryonic blood is carried to the villi by the various branches of the umbilical arteries.

Villi can also be classified by their relations:

• Floating villi float freely in the intervillous space. They exhibit a bi-layered epithelium consisting of cytotrophoblasts with overlaying syncytium (syncytiotrophoblast).
• Anchoring (stem) villi stabilize mechanical integrity of the placental-maternal interface.

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Answer 2

Hey dear
The following process are involved -
1- appearance of lacunal and trabeculal in syncytiotrophoblast
2- erosion of maternal endometrium by syncytiotrophoblast and entry maternal blood into the syncytial lacunal.
3- formation of primary tertiary and secondary choronic villi
4. Formation of cytotrophoblastic shell



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