Body orifice

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

External
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, drinking, 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 in males and females and ejaculation in males
 * In females, the vagina, for menstruation, copulation and birth
 * The nipple orifices

Other animals may have some other body orifices:
 * cloaca, in birds, reptiles, amphibians, and a few mammals
 * siphon in mollusks, arthropods, and some other animals

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