Small, thin, longitudinal folds of nonkeratinized skin medial to the labia majora. The labia minora are hairless and contain sebaceous glands, sweat glands, and many sensory nerve endings. The tissue is highly vascular and engorges when stimulated. In the prepubertal female, the folds extend from the clitoral hood to approximately the midpoint on the lateral wall of the vestibule. In the adult, the labia minora enclose the vestibule, surrounding the opening to the vagina. Singular term is labia minus.