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The chorion is one of the membranes that exists during pregnancy between the developing fetus and mother.
CHORION
Chorionic Villi
Embryonic blood is carried to the villi by the branches of the umbilical arteries, and after circulating through the capillaries of the villi, is returned to the embryo by the umbilical veins.
Villi that sprout from the chorion in order to give a maximum area of contact with the maternal blood.
