placenta, and amniotic sac are pushed out in the afterbirth.

Function

The amniotic sac and its filling provide a liquid that surrounds and cushions the fetus. It is a site of exchange of essential substances, such as oxygen, between the umbilical cord and the fetus. It allows the fetus to move freely within the walls of the uterus. Buoyancy is also provided.

Clinical significance

Chorioamnionitis

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