Extraembryonic Membranes

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Extraembryonic Membranes

The thin layers of tissue that surround the developing EMBRYO. There are four extra-embryonic membranes commonly found in VERTEBRATES, such as REPTILES; BIRDS; and MAMMALS. They are the YOLK SAC, the ALLANTOIS, the AMNION, and the CHORION. These membranes provide protection and means to transport nutrients and wastes.