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 [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.
amnion no·do·sum (n -d s m)n. Nodules in the amnion that consist of stratified squamous epithelium. Also called squamous metaplasia of amnion. |
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
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.
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