ALLANTOTS
\ˈalantˌɒts], \ˈalantˌɒts], \ˈa_l_a_n_t_ˌɒ_t_s]\
Sort: Oldest first
-
A sort of elongated bladder, between the chorion and amnion of the foetus, which is thrown out from the caudal extremity of the embryo, and communicates with the bladder by the urachus. It is very apparent in quadrupeds, but not in the human species. As the allantois is developed, its walls become very vascular, and contain the ramifications of what become the umbilical artery and vein, which, by the elongation of the allantois, are brought through the villi of the chorion, into indirect communication with the vessels of the mother.
By Robley Dunglison
