mucosa, mucous membrane - mucus-secreting membrane lining all body cavities or passages that communicate with the exterior

vagina - the lower part of the female reproductive tract; a moist canal in female mammals extending from the labia minora to the uterus; "the vagina receives the penis during coitus"; "the vagina is elastic enough to allow the passage of a fetus"

imperforate hymen - hymen that is completely closed so that menstrual blood cannot flow out