amniotic sac

amniotic sac

a thin-walled sac that surrounds the fetus during pregnancy. The sac is filled with amniotic fluid - liquid made by the fetus and the amnion (the membrane that covers the fetal side of the placenta) which protects the fetus from injury and helps to regulate the temperature of the fetus. 


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Related Words

amnion

pregnancy

amniotic fluid

fetus

membrane

placenta

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