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amniotic sac


fetus in vitro
The fetus in vitro, showing amniotic sac
Credit: University of Utah, Health Sciences Center
The membranous bag that surrounds the fetus and fills with watery amniotic fluid as pregnancy advances. The amniotic sac is made up of two membranes, the inner amnion and the outer chorion.


Related categories

   • ANATOMY AND PHYSIOLOGY
   • DEVELOPMENTAL BIOLOGY


Source: British Medical Association


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