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amnion (am´ne-on)

Innermost of the extraembryonic membranes enveloping the embryo in utero and containing the amniotic fluid; it consists of an internal embryonic layer with its ectodermal component, and an external somatic mesodermal component; in the later stages of pregnancy the amnion expands to come in contact with and partially fuse to the inner wall of the chorionic vesicle; derived from the trophoblast cells.amniotic sac; [G. the membrane around the fetus, fr. amnios, lamb]
a. nodo´sum nodules in the a. that consist of typical stratified squamous epithelium.squamous metaplasia of amnion;


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