Body orifice
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A body orifice is any opening in the body of an animal.
[edit] 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 eyes, for the sense of sight and crying.
- The mouth, for eating, breathing, and vocalizations such as speech.
- The ear canals, for the sense of hearing.
- The anus, for defecation.
- The urethra, for urination and ejaculation
- In females, the vagina, for sexual intercourse, masturbation, menstruation, and childbirth.
- Orifices of nipples[citation needed]
- Orifices of sweat glands[citation needed]
- Navel or belly button left over from placental mammals after birth.[citation needed]
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.
[edit] Internal orifices
Internal orifices include the orifices of the outflow tracts of the heart, between the heart valves.
