Also found in: Dictionary, Thesaurus, Encyclopedia.
amniotic sacAn amniotic fluid-filled, thin membranous sac, which surrounds the embryo of amniote vertebrates; it provides a fluid cushion, prevents dehydration and acts as a waste receptacle during embryonic development.
membranesObstetrics A popular term for the amniotic sac, see there.
Patient discussion about membranes
Q. HYALINE MEMBRANE DISEASE in pre-mature infants;what are the causes of it in pregnant women?
Q. For those that had an epimacular membrane removed, how long was it before your eye healed? How was your vision afterwards? Do you now require or benefit from glasses?