The vagina is an elastic, muscular canal with a soft, flexible lining that provides lubrication and sensation. The vagina connects the uterus to the outside world. The vulva and labia form the entrance, and the cervix of the uterus protrudes into the vagina, forming the interior end.
The vagina receives the penis during sexual intercourse and also serves as a conduit for menstrual flow from the uterus. During childbirth the baby passes through the vagina (birth canal).
The hymen is a thin membrane of tissue that surrounds and narrows the vaginal opening. It may be torn or ruptured by sexual activity or by exercise.
US CDC. "Trichomoniasis - CDC Fact Sheet," "Bacterial Vaginosis - CDC Fact Sheet."
WebMD Medical Reference. "What's Normal, the First Time?"
WebMD Blog. "Can a Vagina Be Too Big?"
WebMD Medical Reference from eMedicineHealth. "Vaginal Prolapse."
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