The hymen is a thin fold of mucous membrane at the vaginal opening that partly surrounds or covers it. Its shape varies widely between individuals and it normally has an opening.
| Location | Vaginal orifice, at the junction of the vagina and the vestibule |
|---|---|
| Parts |
|
| Nerve Supply | Pudendal nerve (perineal branches) |
| Blood Supply | Internal pudendal artery branches |
| Venous drainage |
|
| Lymphatic drainage |
|
No known essential function; it is a developmental remnant.
An imperforate hymen blocks menstrual blood, causing cyclical pain and a bulging bluish membrane in a teenager with no periods; treatment is a simple incision. The hymen cannot reliably indicate past sexual activity.
A hymen with no opening, causing trapped menstrual blood (haematocolpos).
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