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What (who) is allantois - definition
EMBRYONIC STRUCTURE
Allantoic; Allantoi; Allantoic fluid
![A diagram of a [[monotreme]] egg showing allantois at #4](https://commons.wikimedia.org/wiki/Special:FilePath/Monotreme Egg Diagram.svg?width=200 "A diagram of a [[monotreme]] egg showing allantois at #4")
![umbilicus]], 2 [[amniotic sac]] ([[chorion]] and [[amnion]]), 3 allantois, 4](https://commons.wikimedia.org/wiki/Special:FilePath/Catfetus1.jpg?width=200 "umbilicus]], 2 [[amniotic sac]] ([[chorion]] and [[amnion]]), 3 allantois, 4")
allantois
[?'lant???s]
¦ noun (plural allantoides -?di:z) the fetal membrane lying below the chorion in many vertebrates.
Derivatives
allantoic adjective
allantoid adjective
Origin
C17: mod. L., based on Gk allantoeides 'sausage-shaped'.
Allantois
·noun ·Alt. of Allantoid.
Allantoic
·adj Pertaining to, or contained in, the allantois.
Wikipedia
Allantois
The allantois ( a-LAN-toe-iss; plural allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's conceptus (which consists of all embryonic and extraembryonic tissues). It helps the embryo exchange gases and handle liquid waste.
The allantois, along with the amnion, chorion, and yolk sac (other extraembryonic membranes), identify humans and other mammals, birds, and other reptiles as amniotes. Fish and amphibians are anamniotes, and lack the allantois. In mammals the extraembryonic membranes are known as the fetal membranes.
