The allantois is an extra-embryonic membrane involved in the exchange of gases and handling of liquid waste in reptilian embryos. It plays a crucial role in the development and survival of the embryo within the egg.
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The allantois is one of four extra-embryonic membranes, along with the amnion, chorion, and yolk sac.
It functions primarily in respiration and excretion for the developing embryo.
In reptiles, it often fuses with the chorion to form the chorioallantoic membrane, which facilitates gas exchange.
The allantois stores nitrogenous wastes produced by the embryo during development.
It contributes to the formation of the umbilical cord in mammals but serves different functions in reptiles.