Vagina is a muscular tube composed of mucosa, muscularis and adventitia, which is rich in extensibility and connects uterus and external genitalia. It is an organ for female sexual intercourse, and it is also a conduit for discharging menstruation and giving birth to the fetus.
The normal PH of vaginal discharge is 3.8. The lower part of the vagina is narrow, and the lower end is open to the vaginal vestibule, with a vaginal wall. In virginity, there is hymen around the vaginal opening, which can be ring-shaped, half-moon-shaped, umbrella-shaped or sieve-shaped. After the hymen is broken, there are traces of hymen around the vaginal opening.