amniotic sac


Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to amniotic sac: placenta, amniotic fluid, yolk sac
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.amniotic sac - thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)amniotic sac - thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
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
References in periodicals archive ?
It meant a difficult monochorionic monoamniotic (MoMo) pregnancy for mum Danielle, 28, from Stockton, who had to be monitored three times a day every day due to them sharing the same amniotic sac -although they did not realise they were mirrorimage until after the birth.
These five scientists, who were awarded 2015 March of Dimes Prematurity Research Initiative (PRI) grants, are looking for answers in the placental microbiome, in genes and other factors that control cervical ripening, in the workings of uterine muscle cells, and in the amniotic sac (bag of waters) that surrounds the baby.
CURLED up in his watery cocoon, baby Silas Philips makes a rare entry into the world - sealed in the amniotic sac.
I always clean off the nose if the head is out and the amniotic sac is broken, so the kid doesn't aspirate fluid.
Lisa, 40, first became concerned about her unborn son when doctors discovered the amniotic sac was not attached to the wall of her womb.
Formation of the amniotic sac coincides with formation of the yolk sac, but is usually not visible at this early stage secondary to its very thin membrane.
The pair shared the same amniotic sac and placenta, which gives an increased risk of birth defects and complications.
Monoamniotic twins or often referred to as "Mono Mono" are identical twins who share both a placenta and an amniotic sac, but have separate umbilical cords.
But they shared one amniotic sac and one placenta--a condition known as monoamniotic (or "mono mono")-a rare condition that takes place about one of every 10,000 pregnancies.
Amniocentesis and chorionic villus sampling (CVS) are common prenatal tests used to detect fetal genetic mutations; they analyze fluid or cells extracted from the amniotic sac using a needle that placed through either the abdomen or vagina.
Some physicians sample just one amniotic sac for amniocentesis, thinking that it should cover both twins because they're identical, but there are extremely rare cases of subtle differences that would not be detected by single-sac sampling, he said.
Stitches to the cervix during surgery must be precise; a suture placed a hair's breadth the wrong way can puncture either the amniotic sac or a major blood vessel in the mother.