Membrane which covers the opening into introitus before the first sexual intercourse. It is torn at the first sexual intercourse leading to opening into the vagina. The hymen is porous and hence the individual still performs menstruation every month before the hymen is torn.

In the virgin, a membrane exists between the labia minora, which is just a thin membrane, an extension from the skin of the labia minora, known as the hymen. This covers the introitus (opening into vagina) before the first sexual intercourse. The hymen is porous and usually has a small hole that allows the menstrual flow to pass before removal. It may be absent due to congenital or traumatic reasons. Or it may be imperforate in some women, a condition which is called imperforate hymen. Its structure is variable. It may be concave towards the pubes, or semilunar, cribriform, or fringed (forms border around the labia in a fringed manner). It may also be absent or imperforate. When stretched, it is annular and widest at its posterior aspect. When torn at the first intercourse, rags of its tissue remain even in the multiparous and are called carunculae hymenales (carunculae mytriformes). It guards the opening into the vagina, called introitus. In traditional universal human culture it helps to delineate virginity in the female.

Hymenotomy (Removal of hymen at first intercourse, defloration, disvirgination)

Hymenous Nonhymenous Posterior Anterior
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