Teiary stem villi consists of:-

A. Central core of cytotrophoblast covered with synctiotrophoblast

B. Central core of extra-embryonic mesoderm covered by central cyto- and peripheral synctio- trophoblast

C. Central maternal blood vessels surrounded by mesoderm and trophoblast

D. Central fetal blood vessels surrounded by mesoderm and trophoblast

Correct Answer: Central fetal blood vessels surrounded by mesoderm and trophoblast

Description: Secondary villi:- contains a central core of primary (extra embryonic) mesoderm and is covered by cyto- and syncytio- trophoblast cells. Teiary villicontains fetal blood vessels invading the extra embryonic mesoderm and is covered by trophoblastic cells.

Category: Anatomy

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