Explanation

• Membranes present around the embryo are Chorion
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• Chorion is also called Serosa
• in reptiles, birds, and mammals, the outermost membrane around the embryo.
• It develops from an outer fold on the surface of the yolk sac.
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• The fetal membranes or extraembryonic membranes, are membranes associated with the developing fetus.
• The two chorioamniotic membranes are the amnion and the chorion