allantois

(noun)

membrane in an egg that stores nitrogenous wastes produced by the embryo and facilitates respiration

Related Terms

  • monotreme
  • amnion
  • chorion

Examples of allantois in the following topics:

  • Characteristics of Amniotes

    • However, the eggs of amniotes contain three additional extra-embryonic membranes: the chorion, amnion, and allantois.
    • The allantois stores nitrogenous wastes produced by the embryo and also facilitates respiration.
    • The key features of an amniotic egg are the chorion, amnion, and allantois.
  • Development of the Urinary System

    • The urinary bladder develops from the upper end of the urogenital sinus, which is continuous with the allantois.
    • The allantois degenerates and remains in the adult as a fibrous cord called the urachus (median umbilical ligament).
  • Urinary Bladder Cancer

    • The human urinary bladder is derived in embryo from the urogenital sinus, and it is initially continuous with the allantois.
  • Muscle Development

    • The cells of the inner cell mass (embryoblast), which are known as human embryonic stem cells (hESCs), will differentiate to form four structures: the amnion, the yolk sac, the allantois, and the embryo itself.
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