Body orifice

A body orifice is any opening in the body of an animal.

External orifices

In a typical mammalian body such as the human body, the external body orifices are:

  • The nostrils, for breathing and the associated sense of smell
  • The mouth, for eating, breathing, and vocalizations such as speech
  • The ear canals, for the sense of hearing
  • The nasolacrimal ducts, to carry tears from the lacrimal sac into the nasal cavity
  • The anus, for defecation
  • The urinary meatus, for urination and ejaculation
  • In females, the vagina, for menstruation, sexual intercourse and childbirth

    • Other animals may have some other body orifices:

  • cloaca, in birds, reptiles, amphibians, and some other animals
  • siphon in mollusk, arthropods, and some other animals

    • Internal orifices

    Internal orifices include the orifices of the outflow tracts of the heart, between the heart valves.

    See also

  • Mucosa
  • Mucocutaneous boundary
  • Meatus
  • Body cavity
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    This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Body_orifice

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