What is another word for allantoic membrane?
Pronunciation: [ˈalantˌə͡ʊɪk mˈɛmbɹe͡ɪn] (IPA) 
The allantoic membrane is a fetal membrane found in certain animals and is responsible for the exchange of gases between the embryo and the mother. There are several synonyms for this membrane, which include umbilical membrane, allantochorion, yolk sac placenta, and chorion-vitelline placenta. In birds, the allantoic membrane is known as the allantois or the extraembryonic allantoic sac. These synonyms may be used interchangeably, depending on the context and the organism being studied. Understanding these terms can help researchers better understand fetal development and the role of the allantoic membrane in maternal-fetal exchange.
