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 anus, for defecation
 * The urethra, 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.