The vagina is often in a collapsed state where the front and rear walls are in contact. The lower part of the vagina is narrow, and the lower part is vaginal opening (vaginal? Orifice) opens in the vestibule of vagina. There is a hymen around the virgin vaginal opening, which can be annular, half-moon, umbrella or sieve. After the hymen is broken, there are hymen marks around the vaginal opening. The upper end of the vagina is wide and surrounds the cervix and vagina, forming an annular depression between them, which is called vaginal dome (fornix? of? Vagina), which can be divided into front, back and two sides. The posterior part of the vaginal vault is the deepest, and it is closely adjacent to the recto-uterine depression, separated only by the vaginal wall and a layer of peritoneum. It has great practical significance in clinic, such as drainage of effusion in the depression through the posterior dome. Adjacent to vagina: there are bladder and urethra in front and rectum in the back. Clinically, the rectocele, cervix and cervix can be palpated through the rectal wall. The lower part of vagina passes through the urogenital diaphragm. Urethral-vaginal sphincter and levator ani in diaphragm? Inside? Muscle fiber bundles have a restrictive effect on vagina.