[] In, the vagina is the elastic, muscular part of the. In humans, it extends from the to the. The outer vaginal opening is normally partly covered by a membrane called the. At the deep end, the cervix (neck of the ) bulges into the vagina. The vagina allows for. It also channels (menses), which occurs in humans and closely related as part of the monthly.

Although research on the vagina is especially lacking for different animals, its location, structure and size is documented as varying among species. Female mammals usually have two external openings in the vulva, the opening for the and the vaginal opening for the genital tract. This is different from male mammals, who usually have a single for both. The vaginal opening is much larger than the nearby urethral opening, and both are protected by the in humans. In,, and, the is the single external opening for the gastrointestinal tract, the urinary, and reproductive tracts. To accommodate smoother penetration of the vagina during sexual intercourse or other, vaginal moisture increases during in human females and other female mammals. This increase in moisture provides, which reduces friction.

The texture of the vaginal walls creates friction for the during sexual intercourse and stimulates it toward, enabling. Along with pleasure and bonding, women's sexual behavior with others (which can include or sexual activity) can result in (STIs), the risk of which can be reduced by recommended practices. May also affect the human vagina. The vagina and have evoked strong reactions in societies throughout history, including negative perceptions and language, cultural, and their use as symbols for, spirituality, or regeneration of life., the word vagina is often used to refer to the vulva or to the female genitals in general. By its dictionary and anatomical definitions, however, vagina refers exclusively to the specific internal structure, and understanding the distinction can improve knowledge of the female genitalia and aid in healthcare communication.

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Contents • • • • • • • • • • • • • • • • • • • • • • • • • • • • Etymology and definition The term vagina is from meaning 'sheath' or '; the plural of vagina is either vaginae, or vaginas. The vagina may also be referred to as 'the birth canal' in the context of. Although by its dictionary and anatomical definitions, the term vagina refers exclusively to the specific internal structure, it is used to refer to the or to both the vagina and vulva. Using the term vagina to mean 'vulva' can pose medical or legal confusion; for example, a person's interpretation of its location might not match another's interpretation of the location. Medically, the vagina is the canal between the (or remnants of the hymen) and the, while, legally, it begins at the vulva (between the ). It may be that the incorrect use of the term vagina is due to not as much thought going into the anatomy of the female genitals as has gone into the study of male genitals, and that this has contributed to an absence of correct vocabulary for the external female genitalia among both the general public and health professionals.