amniotic sac

Also found in: Dictionary, Medical, Encyclopedia, Wikipedia.
Related to amniotic sac: placenta, amniotic fluid, yolk sac
  • noun

Synonyms for amniotic sac

thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)

References in periodicals archive ?
Duboe performed a vaginal swab and ordered a "stat "Group B streptococcus (GBS) culture to help rule out infection in light of Heide's presenting condition, the ruptured amniotic sac.
It's vital that all of the placenta and the amniotic sac that held your baby is removed.
Amazingly, the three baby girls shared ONE placenta and ONE amniotic sac and were formed from just ONE egg - a 200 million to one chance alone.
In addition, Siegemund emphasized the importance of "touching" (an internal examination of the cervix and the womb) to determine the infant's position, thus avoiding premature breaking of the amniotic sac to release the "waters," which could be fatal to mother and child.
This causes the tissues which form the amniotic sac to grow in the wrong place.
The longer the time between the breaking of the amniotic sac (waters) and birth, the higher the risk for the infection at the time of birth.
Though it's difficult to see while she's sitting, you can see the amniotic sac starting to bulge through her vagina.
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.
The data are consistent with a neurotrophic role for the protein (1-5) and support the hypothesis that each fetus releases a physiologically defined amount of the protein, in accordance with the role of S100B as a cytokine (1, 2), that appears to be more concentrated in relation to the volume of the amniotic sac, which is not usually twice as voluminous in twins as in singleton pregnancies.
This fetus floats in a protective watery bubble, the amniotic sac, while its limbs take shape.
But he added that it was also possible it may have happened when the needle pierced the amniotic sac.
Between 18 and 22 weeks, during a routine ultrasound exam, a hand-held transducer is moved against the outside of the mother's abdomen, and the baby, placenta and amniotic sac can be visualized.
Other complications of CVS include rupture of the amniotic sac, causing a spontaneous abortion or a miscarriage.
Women had a 10 percent chance of dying in labor and a 20 percent chance of being permanently injured by midwives, who commonly punctured the amniotic sac with dirty fingernails.
Sharing the same amniotic sac in utero, considered "dangerous and unpredictable"