- Vagina
- The vagina extends from the vaginal opening to the cervix, the opening to the uterus. The vagina serves as the receptacle for the penis during sexual intercourse, and as the birth canal through which the baby passes during labor. The average vaginal canal is three inches long, possibly four in women who have given birth. This may seem short in relation to the penis, but during sexual arousal the cervix will lift upwards and the fornix (see illustration) may extend upwards into the body as long as necessary to receive the penis. After intercourse, the contraction of the vagina will allow the cervix to rest inside the fornix, which in its relaxed state is a bowl-shaped fitting perfect for the pooling of semen.
- At either side of the vaginal opening are the Bartholin's glands, which produce small amounts of lubricating fluid, apparently to keep the inner labia moist during periods of sexual excitement. Further within are the hymen glands, which secrete lubricant for the length of the vaginal canal.
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