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An extraembryonic membrane associated with the amniotic cavity; its early formation and geometry differ among mammalian developmental systems.
The amnion is a membrane that surrounds and protects the developing embryo in amniote animals, including humans. It is one of the key components of the amniotic sac, which also includes amniotic fluid. The amnion is a thin, transparent membrane that acts as a cushion, providing a protective environment that helps to prevent injury to the embryo and maintain a stable temperature and humidity level.