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| | Discovery Health :: Vagina |
 | | The vagina is the female internal sex organ that begins on the outside at the vaginal opening and extends about three to five inches inside, ending at the cervix, or neck of the uterus (womb). |
 | | Because of its muscular tissue, the vagina has the ability to expand and contract, like a balloon, allowing a baby to pass through during childbirth, or adjusting to fit snugly around a tampon, a finger or any size penis. |
 | | The outer one-third of the vagina, especially near the opening, contains nearly 90 percent of the vaginal nerve endings and therefore is much more sensitive to touch than the inner two-thirds of the vaginal barrel. |
| health.discovery.com /centers/sex/sexpedia/vagina.html (469 words) |
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