The vagina is part of the female internal genital system, communicating with the opening of the neck of the womb (cervix of the uterus) above and with the exterior below. The lower outer opening is surrounded by the "hymen" in the virgin.
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The vagina serves as the discharging passage for the menstrual flow and for the introduction of the penis and discharge of the semen, and as the passageway of the fetus into the light of day.
The vagina is situated between the bladder in front and the rectum behind and forms a sharp angle with the normally forward-flexed uterus