Allantois

An extra-embryonic membranous sac derived from the YOLK SAC of REPTILES; BIRDS; and MAMMALS. It lies between two other extra-embryonic membranes, the AMNION and the CHORION. The allantois serves to store urinary wastes and mediate exchange of gas and nutrients for the developing embryo.

Year introduced: 1991(1975)

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Tree Number(s): A10.615.284.147, A16.254.750.147

MeSH Unique ID: D000482

Entry Terms:

• Allantoic Membrane
• Membrane, Allantoic

See Also:

• Chorioallantoic Membrane

All MeSH Categories
Anatomy Category
Tissues
Membranes
Extraembryonic Membranes
Allantois

All MeSH Categories
Anatomy Category
Embryonic Structures
Embryo, Mammalian
Extraembryonic Membranes
Allantois