Answer
The four membranes associated with the amniotic egg are: the amnion, allantois, chorion, and yolk sac.
Amnion: Encloses the embryo in fluid. Cushions the embryo and provides an aqueous medium for growth.
Allantois: Forms a sac that stores metabolic wastes.
Chorion: Surrounds the contents of the egg and is highly vascularized.
Yolk Sac: Stores nutrients for nourishment. In marsupial and placental mammals, the yolk sac does not store yolk, but may rather form a temporary yolk-sac placenta between the embryo and mother.
Work Step by Step
The four membranes associated with the amniotic egg are: the amnion, allantois, chorion, and yolk sac.
Amnion: Encloses the embryo in fluid. Cushions the embryo and provides an aqueous medium for growth.
Allantois: Forms a sac that stores metabolic wastes.
Chorion: Surrounds the contents of the egg and is highly vascularized.
Yolk Sac: Stores nutrients for nourishment. In marsupial and placental mammals, the yolk sac does not store yolk, but may rather form a temporary yolk-sac placenta between the embryo and mother.
