Extraembryonic tissue

Extraembryonic tissue includes the four extraembryonic membranes which assist in the development of the animal embryo. The membranes occur in a range of animals from mammals to insects. The tissue originates from the zygote, but is not considered part of the embryo. The membranes typically perform roles in nutrition, gas exchange and waste removal. In humans and other mammals they are more usually known as the fetal membranes.

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