In the chick, four extraembryonic membranes form. The membrane that forms a sac to store metabolic wastes is called the

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The allantoic membrane is the extraembryonic membrane that forms a sac to store metabolic wastes in birds, including chicks. The yolk sac stores nutrients, the amnion surrounds the embryo in a fluid-filled sac, the trophoblast is a layer of cells in mammalian embryos that helps form the placenta, and the chorion is the outermost membrane that surrounds all of the other membranes and the embryo.

In the Chick, Four Extraembryonic Membranes Form