Vagina, Latin for "scabbard", is the name of the tubular tract leading from the uterus to the exterior of the body in female mammals, or to the cloaca[?] in female birds and some reptiles.
In mammals, the exterior vaginal opening is the vulva. A membrane situated behind the urethral opening, the hymen, partially occludes the vagina in many organisms, including some human females, from birth until it is ruptured by first coitus, or by any number of other activites including medical examinations, injury, certain types of exercise, introduction of a foreign object, et cetera.
The vagina serves the purposes of 1) providing a path for menstrual fluids to leave the body, 2) admitting the penis of the male for coitus and ultimately the introduction of male gametes (sperm) for the fertilization of ova, and 3) providing a route to deliver a fully gestated fetus from the uterus to its independent life outside the body of the mother in the process of live birth. During birth, the vagina is referred to as the birth canal[?].
Insects and other invertebrates also have a vagina, which is the terminal part of the oviduct.
For the purposes of anatomy, a vagina can also be any structure that serves as a sheath (or theca[?]), as in, the vagina of the portal vein. Another example is the fibrous sheath around tendons, called a vagina fibrosa[?] when solid or a vagina mucosa[?] when it contains a fluid-filled cavity around the tendon.
Vagina is often used loosely to refer to a woman's external genitalia; strictly speaking, this is called the vulva or pudenda[?] (L. shame), as distinguished from the interior vaginal tract.
See also: Vulvovaginal disorders, Vulvovaginal health, Skene's glands, G-spot, pudenda[?]
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