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Anatomy Embryology and Histology 3e56380a

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
High-Yield Explanation
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.

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