Labia majora

Labia majora is the Latin plural for big ("major") lips. The Latin term labium/labia is used in anatomy for a number of usually paired parallel structures, but in English, it is mostly applied to two pairs of parts of the vulva—labia majora and labia minora. Traditionally, to avoid confusion with other lip-like structures of the body, the vulvar labia were termed by anatomists in Latin as labia majora (or minora) pudendi.

Embryologically, they develop from labioscrotal folds.Manual of Obstetrics. (3rd ed.). Elsevier. pp. 1-16. {{ISBN|9788131225561}}.

The labia majora after puberty may become of a darker color than the skin outside them and grow pubic hair on their external surface.

The main function of the labia majora is to cover and protect the other parts of the vulva.{{cite book|last=Kinsey|first=Brian|title=Human Body From A to Z|publisher =Marshall Cavendish Reference|year = 2011|page=465|access-date = September 29, 2023 |isbn= 978-0-76149-976-3 |url=https://books.google.com/books?id=jhlfEAAAQBAJ}} The labia majora contain the labia minora, interlabial sulci, clitoral hood, clitoral glans, frenulum clitoridis, the Hart's Line, and the vulval vestibule, where the external openings of the urethra and the vagina are located. Each labium majus has two surfaces, an outer, pigmented and covered with strong, pubic hair; and an inner, smooth and beset with large sebaceous follicles. The labia majora are covered with squamous epithelium. Between the two, there is a considerable quantity of areolar tissue and fat, besides vessels, nerves, and glands. Below the skin of the labia majora, there is a tissue called the dartos muliebris, which gives them a wrinkled appearance.{{cite book|last=Fahmy|first=Mohamed A. Baky|title=Normal and Abnormal Scrotum|publisher =Springer International Publishing|year = 2021|page=69|access-date = December 29, 2023 |isbn= 978-3-03083-305-3 |url=https://books.google.com/books?id=hElSEAAAQBAJ&pg=PA69}}

File:Vulva - front view.png

The labia majora constitute the lateral boundaries of the pudendal cleft. The pudendal cleft, also known as the vulvar cleft or cleft of Venus (rima vulvae or rima pudendi in Latin),{{cite book|last=Gould| first=George M.|title=Gould's Pocket Pronouncing Medical Dictionary|editor=Brownslow, C. V|publisher=P. Blakinston's Son & C., Inc. |year=1936|edition=10}} is a vertical fissure between the labia majora starting at the basal point of the mons pubis. After puberty, the clitoral hood and the labia minora can protrude into the pudendal cleft to a variable degree.{{cite journal |last1=Hennekam |first1=RC |last2=Allanson |first2=JE |last3=Biesecker |first3=LG |last4=Carey |first4=JC |last5=Opitz |first5=JM |last6=Vilain |first6=E |title=Elements of morphology: standard terminology for the external genitalia. |journal=American Journal of Medical Genetics. Part A |date=June 2013 |volume=161A |issue=6 |pages=1238–63 |doi=10.1002/ajmg.a.35934 |pmid=23650202|pmc=4440541 }}

File:Labia commissures.jpg, C) posterior commissure]]

The labia majora are thicker in front, and form the anterior labial commissure where they meet below the mons pubis. Posteriorly, they are not really joined, but appear to become lost in the neighboring integument, ending close to, and nearly parallel to, each other. Together with the connecting skin between them, they form another commissure, the posterior labial commissure, which is also the posterior boundary of the vulva. The interval between the posterior commissure and the anus, from 2.5 to 3 cm in length, constitutes the perineum.{{Gray's|page=1265|inline=1}} The anterior region of the perineum is known as the urogenital triangle, which separates it from the anal region. Between the labia majora and the inner thighs are the labiocrural folds. Between the labia majora and labia minora are the interlabial sulci. Labia majora atrophy after menopause.

While the labia majora is present in all female primates, many have them until adulthood or become inconspicuous around that period.{{cite book|last=Sheets-Johnstone|first=Maxine|publisher=Temple University Press|year = 2010|title=The Roots of Thinking|page=184|access-date=November 19, 2023|isbn=978-1-43990-365-0|url=https://books.google.com/books?id=2X0EXP5ahtsC&pg=PA184}} Primates besides humans that always have visible labia majora are bonobos, strepsirrhines, tarsiers, cebid monkeys, and gibbons.{{cite book|last=Ankel-Simons|first=Friderun|publisher=Elsevier Science|year = 2012|title=Primate Anatomy: An Introduction|page=523|access-date=November 19, 2023|isbn=978-0-08046-911-9|url=https://books.google.com/books?id=Mwl3M6c5KzoC&pg=PA523}}{{cite book|last=Rosenblum|first=Leonard A.|publisher=Elsevier Science|year = 2013|title=Primate Behavior: Developments in Field and Laboratory Research · Volume 2 |page=251|access-date=November 19, 2023|isbn=978-1-48327-182-8|url=https://books.google.com/books?id=QingBAAAQBAJ&pg=PA251}}{{cite book|last=Poiani|first=Aldo|publisher=Cambridge University Press|year= 2010|title=Animal Homosexuality: A Biosocial Perspective|page=156|access-date=November 19, 2023|isbn=978-1-13949-038-2|url=https://books.google.com/books?id=EftT_1bsPOAC&pg=PA156}}

In non-primate female mammals, the labia majora are absent since the labioscrotal swellings have disappeared as a fetus.{{cite book|last=Kumar|first=M.S.A.|publisher=Linus Learning|year = 2015| title=Clinically Oriented Anatomy of the Dog & Cat| page=1254|isbn=978-1-60797-552-6|url=https://books.google.com/books?id=ZBSSDwAAQBAJ&pg=PA1254}} Because of this, the pudendal cleft refers to the slit between the labia vulvae in those mammals.{{cite book |last1=Studdert | first1=Virginia P. |last2=Gray |first2=Clive C. | publisher=Elselvier Health Sciences |year=2011 | title=Saunders Comprehensive Veterinary Dictionary E-Book |page=1183 |isbn=978-0-70204-744-2|url=https://books.google.com/books?id=6dvQAQAAQBAJ&pg=PA1183}}

The fat pad of the labia majora can be used as a graft, often as a so-called "Martius labial fat pad graft", and can be used, for example, in urethrolysis.{{Cite journal | last1 = Carey | first1 = J. M. | last2 = Chon | first2 = J. K. | last3 = Leach | first3 = G. E. | doi = 10.1016/S0090-4295(03)00117-1 | title = Urethrolysis with martius labial fat pad graft for iatrogenic bladder outlet obstruction | journal = Urology | volume = 61 | issue = 4 | pages = 21–25 | year = 2003 | pmid = 12657357}}

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• [http://www.emedicinehealth.com/script/main/art.asp?articlekey=6190 Labia Majora Medical Definition] ({{Webarchive|url=https://web.archive.org/web/20160304203730/http://www.emedicinehealth.com/script/main/art.asp?articlekey=6190 |date=2016-03-04 }})

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Category:Mammal female reproductive system

Category:Vulva

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