The adult vaginal anatomy is normally about 3 inches (7.5 cm) long and slopes upward and backward. Internally, the bladder is in front of the vagina and the rectum RECTUM in back. The vagina receives the erect penis in coitus; spermatozoa are discharged into it, swim through the cervical canal, and enter the uterus. The vagina is also the passage for menstrual discharge, and it functions as the birth canal.
anatomy of the vagina
The interior lining of the vagina is mucous membrane; muscles and fibrous tissue form its walls. In pregnancy, changes occur in these tissues, enabling the vagina to stretch to many times its usual size during labor and childbirth. In a virgin, the opening of the vagina is usually, but not necessarily, partially closed by a membrane, the "hymen" HYMEN. Usually the hymen breaks at first intercourse; occasionally it ruptures during physical exercise.
In a normal state, the lining of the vagina secretes a fluid that is fermented to an acid by the bacteria that are usually present. This acidity probably helps to protect the vagina from invasion by other organisms.
Douching as a regular practice should not be employed except when recommended by a health care provider.
vaginal anatomy
