Question

where is the location of chorion and amnion? within the tophoblast or outside?​

Answer 1

Answer:

The chorion is the outermost fetal membrane around the embryo in mammals, birds and reptiles (amniotes). It develops from an outer fold on the surface of the yolk sac, which lies outside the zona pellucida (in mammals), known as the vitelline membrane in other animals.

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