Amnion - Definition, Function and Quiz | Biology Dictionary
2017年6月2日 · The amnion is an extraembryonic membrane that surrounds a developing amniote embryo. It acts as a protective sac along with three other extraembryonic membranes: the chorion, the yolk sac, and the allantois.
Amnion - Wikipedia
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 and become the amniotic sac that provides a protective environment for the developing embryo.
Amniotic membrane: from structure and functions to clinical ...
Amniotic membrane (AM) or amnion is a thin membrane on the inner side of the fetal placenta; it completely surrounds the embryo and delimits the amniotic cavity, which is filled by amniotic liquid.
Amnion | Fetal Membrane, Embryonic Sac & Placental ...
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 referred to as the bag of waters. In development, the amnion arises …
Amnion Definition & Meaning - Merriam-Webster
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.
27.3C: Amnion Development - Medicine LibreTexts
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. Its floor consists of the prismatic ectoderm of the embryonic disk.
Prenatal development - Amniotic Sac, Embryo, Fetus | Britannica
2024年11月23日 · Prenatal development - Amniotic Sac, Embryo, Fetus: A cleft separates the outermost cells of the inner cell mass of the blastocyst from the remainder, which then becomes the embryonic disk. The split-off, thin upper layer is the amnion, which remains attached to the periphery of the embryonic disk.