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What (who) is chorio-allantoic placenta - 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")
placenta praevia
PLACENTA DISEASE THAT IS CHARACTERIZED BY PLACENTA ATTACHMENT TO THE UTERINE WALL CLOSE TO OR COVERING THE CERVIX
Placenta previa; Praevia placenta
['pri:v??]
(US placenta previa)
¦ noun Medicine a condition in which the placenta partially or wholly blocks the neck of the uterus, so interfering with normal delivery of a baby.
Origin
C19: from L. praevia 'going before', feminine of praevius.
Placenta praevia
PLACENTA DISEASE THAT IS CHARACTERIZED BY PLACENTA ATTACHMENT TO THE UTERINE WALL CLOSE TO OR COVERING THE CERVIX
Placenta previa; Praevia placenta
Placenta praevia is when the placenta attaches inside the uterus but in a position near or over the cervical opening. Symptoms include vaginal bleeding in the second half of pregnancy.
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.
