(redirected from amniotic sac)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to amniotic sac: placenta, amniotic fluid, yolk sac


see Sac and FoxSac and Fox,
closely related Native Americans of the Algonquian branch of the Algonquian-Wakashan linguistic stock (see Native American languages). Sac and Fox culture was of the Eastern Woodlands area with some Plains-area traits (see under Natives, North American).
..... Click the link for more information.


A soft-walled cavity within a plant or animal, often containing a special fluid and usually having a narrow opening or none at all.
Indentation in the contour lines of equal depth showing submarine relief.


a pouch, bag, or pouchlike part in an animal or plant


1. An early system on the Datatron 200 series.

[Listed in CACM 2(5):16 (May 1959)].
References in periodicals archive ?
Still, to reach the fetus, the instruments must penetrate the amniotic sac, which cannot heal or easily be sewn shut because it is so fragile.
The researchers dubbed the new structure a post-implantation amniotic sac embryoid, or PASE.
In most cases, the amniotic sac is broken during the strenuous process of childbirth, which is known as 'water breaking,' while it is pierced with a scalpel during a cesarean birth.
Other cases similar to this can be found, such as the case depicted by Goss and McDougall (1992) in which a young woman feigned antepartum hemorrhage and ruptured her amniotic sac with a knitting needle at twenty-six weeks gestation.
The amniotic sac protruded through vulva as an intact, opaque, white structure, which ruptured soon due to foetal movements of vigorous uterine contractions.
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.
Young babies tend to have natural instinct to swim because their first environment inside their mothers' womb was also surrounded with water called the amniotic sac.
On September 3, the zoo's senior female Tapir Rinny gave bith to a tiny baby, but keepers watching on CCTV realised she could not break the amniotic sac.
The target company markets the AmniSure assay for identifying whether a pregnant woman has rupture of fetal membranes, a condition in which fluid leaks from the amniotic sac prematurely.