#amniotic sac

• 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.
• Amniotic — Belonging to the amnion, relating to the amnion or the gestational sac of the embryo; produced, secreted, or located inside the fetal cavity. In a clinical context, the term describes the fluidic, cellular, or structural elements that compose and support the intrauterine developmental environment of the fetus.