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The amnion (pl.: amnions or amnia) is a membrane that closely covers human and various other embryos when they first form. It fills with amniotic fluid, which causes the amnion to expand …

Amnion, in reptiles, birds, and mammals, a membrane forming a fluid-filled cavity (the amniotic sac) that encloses the embryo. The amniotic sac and the fluid it contains are sometimes …

Jul 19, 2025 · The amnion is the thin but durable innermost membrane that surrounds and protects a developing embryo, and later the fetus, during pregnancy. It is a component of the …

The meaning of AMNION is a thin membrane forming a closed sac about the embryos or fetuses of reptiles, birds, and mammals and containing the amniotic fluid.

Jul 14, 2025 · Main The amnion is an extra-embryonic structure essential for the development of reptilian, avian and mammalian embryos as it encases the embryo, providing both mechanical …

The amnion is a closed sac appearing in the inner cell mass as a cavity. This cavity is roofed in by a single stratum of flattened, ectodermal cells called the amniotic ectoderm.

Dec 22, 2025 · amnion (plural amnions or amnia) (anatomy) The innermost membrane of the fetal membranes of reptiles, birds, and mammals; the sac in which the embryo is suspended. …

Aug 6, 2025 · The amnion is the innermost fetal membrane that forms a protective, fluid-filled sac around a developing embryo or fetus, providing a stable, cushioned, and sterile environment …

Amnion is defined as a fluid-filled sac that surrounds the embryo in higher vertebrates, including reptiles, birds, and mammals, providing moisture and protection from shock during the …