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Answer on Zoology Question for Sanjukta Ghosh

Question #63671
What is the foetal part of Choriovitelline placenta (or Yolk-sac placenta) formed of?

It is formed of chorion and yolk sac? Why's the vitelline in the name?
Expert's answer
A a foetal portion of Choriovitelline placenta is formed by the chorion.
Choriovitelline placenta is a type of placenta in which the yolk sac becomes an intermediary in the fetal-maternal relationship. There the vitelline takes up the whole of the inner embryonic layer and surrounds the embryo. The allantois shrinks.

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