amnion /am·ni·on/ (am´ne-on) bag of waters; the extraembryonic membrane of birds, reptiles, and mammals, which lines the chorion and contains the fetus and the amniotic fluid.amnion´ic 
amniot´ic
amnion
amnion [am´ne-on]
)
Amnion, chorion, and other embryonic membranes surrounding the embryo of a placental mammal.
amnion nodo´sum a nodular condition of the fetal surface of the amnion, observed in oligohydramnios associated with absence of the kidneys of the fetus.
am·ni·on ( m n - n, - n )n. pl. am·ni·ons or am·ni·a (-n -) The thin, membranous sac filled with a serous fluid in which the embryo or fetus is enclosed and suspended in the uterus. Also called amniotic sac. am ni·otic (-t k), amni·onic (-nk) adj. |
amnion
[am′nē·on]
Etymology: Gk, amnos, lamb's caul
a membrane, continuous with and covering the fetal side of the placenta, that forms the outer surface of the umbilical cord. Compare chorion. amniotic, adj.
amnion [am´ne-on]
the innermost fetal membrane, which forms a sac filled with amniotic fluid that surrounds the embryo and later the fetus; as it enlarges it gradually obliterates the chorionic cavity and enfolds the umbilical cord. Called also bag of waters.
Amnion, chorion, and other embryonic membranes surrounding the embryo of a placental mammal. From Dorland's, 2000.
amnion nodo´sum a nodular condition of the fetal surface of the amnion, usually appearing near the insertion of the cord; it may be associated with multiple congenital abnormalities, especially hypoplastic kidneys and oligohydramnios.
amnion (amˑ·nē·
n),n membrane covering the placenta on the side that faces the fetus; also forms the outer layer of the umbilical cord.
amnion
the innermost membrane enclosing the developing fetus and which is filled with amniotic fluid; characteristic of reptiles, birds and mammals. See also amniotic.
amnion nodosum
a nodular condition of the fetal surface of the amnion, observed in oligohydramnios associated with absence of the kidneys in the fetus.
Patient discussion about amnion.
Q. what does it mean when an ultrasound shows an empty amniotic sac and no baby?
A. This exact thing happened with my friend who is now 22 weeks with her first baby. She had 2 additional sacs - both empty - and the doctor said that the pregnancy had probably started out as triplets but that only one of the embryos had actually established and continued to grow.
Her doctor said it is very common for a woman to have more than one egg fertilize but that in most cases the pregnancy continues as a singleton only. She told my friend that the empty sacs would just disappear through time (which they did) and that they posed no danger to her baby.
Read more or ask a question about amnionHer doctor said it is very common for a woman to have more than one egg fertilize but that in most cases the pregnancy continues as a singleton only. She told my friend that the empty sacs would just disappear through time (which they did) and that they posed no danger to her baby.
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