#amnion

• Amnion — A prefixal form or rare variant used in medical and biological terminology to designate the amnion, the membrane of the embryonic sac that protects the fetus during gestation. In archaic or regional contexts, the term may refer directly to the amniotic fluid or the early protective structure of the amniotic egg in vertebrates.
• Amnio- — A prefix or initial element of learned composition used in international medical terminology to form new words relating to the amnion, the embryonic sac, or the amniotic fluid. It serves as a precise structural indicator in naming clinical procedures, gestational pathologies, or anatomical membranes specific to fetal development.
• Amnion — The innermost, thin, and tough extraembryonic membrane that delineates the gestational sac in reptiles, birds, and mammals. This cellular structure secretes the amniotic fluid, providing the embryo and later the fetus with a sterile, thermally constant, and protective aquatic environment against mechanical shocks or destructive tissue adhesions.