allantois definition

  • noun:
    • A membranous sac that develops from posterior an element of the alimentary channel inside embryos of animals, wild birds, and reptiles. It is necessary within the development associated with umbilical cable and placenta in animals. Also referred to as allantoid.
    • A sac, having numerous functions, that develops into the alimentary channel for the embryos of animals, wild birds and reptiles.
    • A membranous appendage of the embryos of animals, wild birds, and reptiles, -- in animals offering to get in touch the fetus aided by the moms and dad; the urinary vesicle.
    • A fetal appendage of most vertebrates, building as a sac or diverticulum from posterior part of the abdominal cavity.
    • the vascular fetal membrane layer that lies below the chorion and develops from hindgut in a lot of embryonic higher vertebrates (reptiles, wild birds and mammals)

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