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A membranous sac that develops from the posterior part of the alimentary canal in the embryos of mammals, birds, and reptiles, and it is important in the formation of the umbilical cord and placenta in mammals[VHOG]. [ http://en.wikipedia.org/wiki/Allantois VHOG:0000738 ]

This is just here as a test because I lose it

Term information

Subsets

pheno_slim

depicted by

http://upload.wikimedia.org/wikipedia/commons/a/a5/Gray25.png

development notes

a diverticulum of the hindgut endoderm [ISBN:0073040584 (Vertebrates, Kardong)]

external definition

A membranous sac that develops from the posterior part of the alimentary canal in the embryos of mammals, birds, and reptiles, and it is important in the formation of the umbilical cord and placenta in mammals. [TFD][VHOG]

external ontology notes

part_of embryo in EHDAA2 - note differences in humans

has related synonym

allantoic bud

homology notes

Structures homologous to the four extraembryonic membranes of reptiles and birds appear in mammals: amnion, chorion, yolk sac, and allantois.[well established][VHOG]

id

UBERON:0004340