The outermost embryonic membrane in the mammal is the
Answer Details
The outermost embryonic membrane in mammals is the chorion. The chorion is the membrane that develops around the embryo, and it is responsible for the exchange of gases between the embryo and the mother's bloodstream. In placental mammals, the chorion also plays a crucial role in the formation of the placenta, which nourishes the developing embryo. The other embryonic membranes include the amnion, which surrounds the embryo and contains the amniotic fluid, the allantois, which helps with waste disposal and contributes to the formation of the umbilical cord, and the yolk sac, which provides some nutrition to the embryo in some animals.