labia minora

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      The labia minora (Latin for 'smaller lips', sg.: labium minus), also known as the inner labia, inner lips, or nymphae, are two flaps of skin that are part of the primate vulva, extending outwards from the inner vaginal and urethral openings to encompass the vestibule. At the glans clitoris, each labium splits, above forming the clitoral hood, and below the frenulum of the clitoris. At the bottom, the labia meet at the labial commissure. The labia minora vary widely in size, color and shape from individual to individual.
      The labia minora are situated between the labia majora and together form the labia. The labia minora are homologous to the penile raphe and ventral penile skin in males.


      Structure and functioning


      The labia minora extend from the clitoris obliquely downward, laterally, and backward on either side of the vulval vestibule, ending between the bottom of the vulval vestibule and the labia majora. The posterior ends (bottom) of the labia minora are usually joined across the middle line by a flap of skin, named the frenulum of labia minora.
      On the front, each lip forks dividing into two portions surrounding the clitoris. The upper part of each lip passes above the clitoris to meet the upper part of the other lip—which will often be a little larger or smaller—forming a fold which overhangs the glans clitoridis (clitoral tip or head); this fold is named the clitoral hood. The lower part passes beneath the glans clitoridis and becomes united to its under surface, forming, with the inner lip of the opposite side, the frenulum clitoridis.
      The clitoral hood serves to cover most of the time the shaft and sometimes the glans (which is very sensitive to the touch) to protect the clitoris from mechanical irritation and from dryness. Yet the hood is movable and can slide during clitoral erection or be pulled upwards a little for greater exposure of the clitoris to sexual stimulation.


      = Histology

      =
      On the opposed surfaces of the labia minora are numerous sebaceous glands not associated with hair follicles. They are lined by stratified squamous epithelium on those surfaces.
      Like the whole area of the vulval vestibule, the mucus secreted by those glands protects the labia from dryness and mechanical irritation.


      = Variation

      =

      Being thinner than the outer labia, the inner labia can be also more narrow than the former, or wider than the labia majora, thus protruding in the pudendal cleft and making the term minora (Latin for smaller) essentially inapplicable in these cases. They can also be smooth or frilled, the latter being more typical of longer or wider inner labia.
      From 2003 to 2004, researchers from the Department of Gynaecology, Elizabeth Garrett Anderson Hospital in London, measured the labia and other genital structures of 50 women from the age of 18 to 50, with a mean age of 35.6. The study has since been criticized for its "small and homogenous sample group" consisting primarily of white women. The results were:

      Due to the frequent portrayal of the pudendal cleft without protrusion in art and pornography, there has been a rise in the popularity of labiaplasty, surgery to alter the labia—usually, to make them smaller. On the other hand, there is an opposite movement of labia stretching. Its proponents stress the beauty of long labia and their positive role in sexual stimulation of both partners.
      Labiaplasty is also sometimes sought by women who have asymmetrical labia minora to adjust the shape of the structures towards identical size.
      Labia stretching has traditionally been practised in some African nations in the East and South and the South Pacific.


      = Functioning

      =
      The inner lips serve to protect from mechanical irritation, dryness and infections of the highly sensitive area of the vulval vestibule with vaginal and urethral openings in it between them. During vaginal intercourse, they may contribute to stimulation of the whole vestibule area, the clitoris and the vagina of the woman and the penis of her partner. Stimulation of the clitoris may occur through tension of the clitoral hood and its frenulum by the inner labia pulling at them. During sexual arousal, they are lubricated by the mucus secreted in the vagina and around it to make penetration painless and protect them from irritation.
      As the female external urethral opening (meatus) is also situated between labia minora, they may play a role in guiding the stream of the urine during female urination.


      = Medical conditions

      =
      Being very sensitive by their structure to any irritation, and situated in the excretion area where traces of urine, vaginal discharge, smegma and even feces may be present, the inner lips may be susceptible to inflammatory infections of the vulva such as vulvitis.
      The likelihood of inflammation may be reduced through appropriate regular hygienic cleansing of the whole vulval vestibule, using water and medically tested cleansing agents designed for vulvas. To avoid contamination of the vulva with fecal bacteria, it is recommended that the vulva is washed only from front to back, from mons pubis to the perineum and anus. Apart from water and special liquid cleansing agents (lotions), there are commercially available wet wipes for female intimate hygiene. Some women wipe the vulval vestibule dry with toilet tissue after urination to avoid irritation and infections from residual drops of the urine in the area.
      However, incorrect choice of cleansing agents, or their incorrect application, may itself cause labial irritation and require medical attention. Over-vigorous rubbing of the labia of little girls while washing, combined with the lack of estrogen in their bodies, may lead to the mostly pediatric condition known as labial fusion. If fused labia prevent urination, urine may accumulate and cause pain and inflammation.
      In adult females, irritation of the area may be caused by wearing too-tight underwear (especially where wider inner labia protrude in the pudendal cleft); while G-strings, which rub against the labia during body movements, may cause irritation or lead to infection from bacteria transferred from either the external environment or the anus.


      Other animals



      The labia minora in non-primate placental mammals (namely Euungulata and Carnivora) are a sole pair of small labia that protect the internal vestibule and are rather called the labia vulvae or simply labia. In primates, they are called labia minora to differentiate them from the labia majora, the latter of which are a feature only present in the Primates order.
      When the labia vulvae are closed together, they form a pudendal cleft. The joining of the labia vulvae top and bottom are respectively referred to as the anterior and posterior commissures.


      Additional images

























      See also


      Femalia
      Labia pride
      Labia stretching
      Labiaplasty


      References




      External links

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    Labia minora - Wikipedia

    The labia minora in non-primate placental mammals (namely Euungulata and Carnivora) are a sole pair of small labia that protect the internal vestibule and are rather called the labia vulvae or simply labia.

    Innie vs. outie vagina: What are the differences? Learn more here

    Jan 26, 2024 · When people refer to an innie or outie vagina, they are typically referring to the labia majora and labia minora. Some people may also refer to these parts of the vulva as the “lips.” The labia...

    Labia Minora: What Is It, Location, and More - Osmosis

    Jan 6, 2025 · The labia minora are part of the external female genitals, or genitals present in individuals assigned females at birth, which also includes the mons pubis, labia majora, vaginal opening, hymen, and clitoris.

    Lopsided Vagina: 9 Different Labia Shapes, Colors, and Sizes

    Jul 3, 2023 · When people mention vaginal appearance (“lopsided” or otherwise), they’re usually talking about the labia, or “vaginal lips.” The fleshy outer lips of the vulva are known as the labia majora. The...

    External female genitalia: Anatomy and blood supply | Kenhub

    Oct 10, 2022 · Found medial to the labia majora are the labia minora (singular, labium minus), which are much thinner, devoid of fat and entirely hairless. Their frontal ends split to form upper and lower layers. The upper layer goes superior to the clitoris and forms a fold called prepuce.

    Vulvar Anatomy - Understanding the External Genitalia (PDF)

    Feb 5, 2025 · The labia minora, or “inner lips” are thinner skin folds ranging in length that do not contain any hair. Their main function is to protect the vaginal and urethral openings from dryness, irritation and infections .

    Labia Minora Hypertrophy: Causes, Symptoms, and Treatment - WebMD

    Apr 29, 2024 · When your labia minora is much larger than the labia majora or it protrudes below your outer lips, this is called labia minora hypertrophy. This condition can cause discomfort or irritation,...

    The Labia Minora: Anatomy and 3D Illustrations - Innerbody

    4 days ago · The labia minora are a pair of thin cutaneous folds that form part of the vulva, or external female genitalia. They function as protective structures that surround the clitoris, urinary orifice, and vaginal orifice.

    Anatomy, Abdomen and Pelvis: Female Internal Genitals

    Jul 24, 2023 · The female reproductive system is an intricate arrangement of structures that can separate into external and internal genitalia. The external genitalia comprises the structures outside of the true pelvis, including the labia majora and minora, vestibule, Bartholin glands, Skene glands, clitoris, mons pubis, perineum, urethral meatus, and periurethral area. The internal genitalia is the ...

    Labia Minora - an overview | ScienceDirect Topics

    The labia minora (“minor lips”) are paired folds of smooth tissue underlying the labia majora. They range from light pink to brownish black in color in different individuals.