labia majora
labia majora, in the female reproductive system, the outer folds of skin that form part of the external genitalia, collectively known as the vulva. The labia majora are homologous to the male scrotum, meaning they arise from the same embryonic tissues and serve comparable protective functions.
The folds of skin that comprise the labia majora extend downward and in a posterior direction from the mons pubis to merge with the skin of the perineum. The outer surface of each labium is pigmented and hairy; the inner surface is smooth but possesses sebaceous glands. The labia majora contain loose connective tissue and sweat glands, as well as fat, which influences their size and shape. This is especially apparent during menopause, when decreasing estrogen levels contribute to a loss of fatty tissue, causing the labia to atrophy.
- Related Topics:
- vulva
The labia majora serve several important functions in protecting and supporting the external female genitalia. They shield the clitoris, urethra, and vaginal opening from friction, trauma, and infection, and their sebaceous glands secrete oils that help lubricate the vulva during sexual activity. Rich in nerve endings, the labia majora also contribute to sexual sensation. Structurally, they provide cushioning and support for the vulva and help maintain its overall shape and appearance.
