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amniotic sac

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.17 sec.
amniotic sac
See amnion.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.amniotic sac - thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
amnion, amnios
amniote - any member of the Amniota
mammal, mammalian - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
fetal membrane - any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus
sac - a structure resembling a bag in an animal
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? Mentioned in ? References in periodicals archive
 
Deep inside his blackberry-shaped blastocyst, some of his cells clumped together to form an "inner cell mass" that would later become Jacob's body, umbilical cord, and amniotic sac.
The amazing placenta: take a closer look at the organ your baby ... by Buckley, Sarah J. / Mothering
The boy had been born at 34 weeks' gestational age (weight 2,300 g), and he was treated for a few days with antimicrobial drugs after prolonged rupture of amniotic sac membranes, even though early-onset infection had not been confirmed.
Human metapneumovirus RNA in encephalitis patient by Simon, Arne / Emerging Infectious Diseases
With another set of experiments, they uncovered evidence that SPA triggers birth by activating fetal immune cells called macrophages, which then leave the amniotic sac and travel to the uterus.
Fetal lungs tell mom when to deliver baby by Travis, John / Science News
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