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The Vulva

The vulva is the external female genital complex: mons pubis, labia majora and minora, clitoris, vestibule (including urethral meatus, vaginal introitus, Bartholin and Skene gland openings), vestibular bulbs, and perineal body.

See also Vaginal Anatomy for structures proximal to the introitus; Female Urethra for the sphincteric anatomy at the anterior vestibule; and Perineum for the perineal body and superficial/deep pouches.

Female perineal muscles and external landmarks

Female perineal muscles and external landmarks, including the clitoris, urethral opening, vaginal introitus and perineal body.

Components (external → medial)​

StructureKey featuresOperative relevance
Mons pubisFatty pad over pubic symphysis; hair-bearing after pubertyFlap territory for neovagina lining and for genitoplasty
Labia majoraHair-bearing, fat- and sebaceous-gland-rich, homolog of the scrotumDonor site for Martius labial-fat-pad flap; vulvectomy and reconstruction territory
Labia minoraThin, hairless, sebaceous; highly variable in size (observed length 5–100 mm and width 1–61 mm across sides in 657 white women aged 15–84)[5]; merge anteriorly as clitoral hood / frenulum and posteriorly at the posterior fourchetteLabiaplasty, vestibulectomy, clitoral-hood reconstruction; territory for vaginoplasty lining flaps
ClitorisGlans + body + paired crura (see below)The focus of sensory preservation in every genital operation
VestibuleBounded by Hart's line laterally; contains urethral meatus anteriorly and vaginal introitus posteriorly; openings of Bartholin glands at 5 and 7 o'clock and Skene (paraurethral) glands alongside the urethral meatusSite of vulvodynia (vestibulodynia), urethral-diverticulum access, Bartholin-gland procedures
Vestibular bulbsPaired erectile structures lateral to the vaginal opening, homolog of the corpus spongiosum[4][6]Sexual response; dissection margin during vestibulectomy
Perineal bodyFibromuscular convergence zone between the introitus and anus[3]; mean craniocaudal height on ultrasound was 22.5 mm in 22 healthy nulliparous volunteers[19]Anchors bulbospongiosus, superficial and deep transverse perinei, external anal sphincter, and posterior vaginal fascia; the reconstructive target of perineorrhaphy and the damaged structure in OASIS lacerations

The Clitoris — the Dominant Sensory Structure​

See Clitoral Anatomy and Physiology for the dedicated anatomy, neurovascular, embryology, physiology, and imaging discussion.

The clitoris has three continuous components:[2][6][7]

ComponentDimensionsTissue type
Glans5–12 mm long, 3–10 mm wide (cadaveric range)No erectile tissue; high nerve density
Body (shaft)13–59 mm long, 5–14 mm wide; sits under the mons pubis / clitoral hoodPaired corpora cavernosa with tunica albuginea
Crura25–68 mm long, paired, attached to the ischiopubic ramiErectile corpora cavernosa continuous with the body

Anatomical facts that drive operative behavior:

  • The clitoris is substantially larger than its visible component. Most of its mass is the body and the paired crura, which run along the inferior pubic rami deep to the labia majora and the bulbospongiosus.
  • The clitoral neurovascular bundle (paired dorsal nerve and dorsal artery of the clitoris) runs adjacent to the medial surface of the inferior pubic ramus, surrounded by a dense fibrous capsule adherent to the periosteum, and then deep to connective tissue layers contiguous with the suspensory ligament of the clitoris. In a study of 27 female cadavers (22 examined grossly and five histologically), Jackson et al. found dorsal nerve widths of 2–4 mm at the lateral crura and 1–2 mm at the distal clitoral body, and noted that deep dissection or suture placement can injure the nerve.[7]
  • Nerve density gradient. Nerve density is significantly greater in the dorsal than the ventral half of the clitoral body.[7] The glans is densely innervated; preserving it is intended to protect sensation. In seven adult cadavers, Tappy et al. found the highest somatic and autonomic nerve densities in the dorsal nerve subregion and dorsal region at the distal clitoral-body level, underscoring protection of these structures during dissection.[25]
  • Nerve density on the labia minora was higher in the distal than the proximal half in the same study, although the difference was not statistically significant. It is a detail to consider in labiaplasty incision design.[7]

Axial and sagittal T2-weighted MRI of normal clitoral anatomy, vestibular bulbs and urethra

Normal clitoral anatomy on MRI in a 67-year-old woman imaged for follow-up of a repaired urethral diverticulum: axial T2-weighted image (a) and sagittal fat-saturated T2-weighted images (b, c). The T2-hyperintense or intermediate vestibular bulbs (black arrows) flank the vaginal introitus (dashed white arrows). The T2-hyperintense crura (white arrows) run inferior to the inferior pubic rami and join anteriorly to form the clitoral body (grey arrow). The glans is ovoid and intermediate in signal (white arrowheads). The urethra (black dashed arrow) lies anterior to the vaginal introitus. From Golden E, et al. Abdom Radiol (NY). 2026;51(4):2106-2124, Fig. 1 (CC BY).[1]

Clitoral NVB. During any operation approaching the clitoral body or crura (vestibulectomy, urethral-diverticulum repair, radical vulvectomy, gender-affirming vaginoplasty or metoidioplasty, clitoral reconstruction after FGM), the dorsal nerve and artery of the clitoris course beside the medial surface of the inferior pubic ramus within a fibrous capsule adherent to the periosteum.[7] A common operative teaching is to keep the neurovascular bundle with its investing fascia rather than dissect on the corporal surface, where fine branches can be transected.

Innervation​

The vulva has sensory, autonomic, and motor innervation, with the main supply from the terminal branches of the pudendal nerve (S2–S4):[8][11]

BranchDestination
Dorsal nerve of the clitorisClitoris (glans dominantly); the main sensory supply to the organ
Perineal (posterior labial) nervesLabia majora/minora and vestibule
Inferior rectal nervePerineum, perianal skin, external anal sphincter

The pudendal nerve courses through Alcock's (pudendal) canal on the medial surface of the obturator internus, passing behind the ischial spine and sacrospinous ligament. The canal is the site of pudendal-nerve block, pudendal entrapment syndrome, and the anatomic caution during sacrospinous-ligament fixation (SSLF) and pudendal-canal decompression.

Ilioinguinal (L1) and genitofemoral (L1–L2) branches also supply the mons and anterior labial skin, paralleling their male equivalents.

The perineal branch of the posterior femoral cutaneous nerve is a distinct, separate sensory contributor. A cadaveric dissection of 20 adults (40 sides) found it arising from the posterior femoral cutaneous nerve or the inferior cluneal nerve (absent on 15% of sides), giving branches to the medial thigh and a descending branch to the lower labia majora (scrotum in men). Numbness after vulvar or perineal dissection that extends posteriorly and laterally beyond the pudendal distribution can reflect injury to this nerve.[16]

Autonomic innervation arrives via the inferior hypogastric (pelvic) plexus:

  • Parasympathetic (S2–S4, pelvic nerve). Erectile function of the clitoral body and crura and vestibular bulbs; glandular secretion (Bartholin, Skene).
  • Sympathetic (T10–L2, hypogastric nerve). Vasoconstriction and default tone.

Motor innervation. Perineal branches of the pudendal nerve drive the bulbospongiosus, ischiocavernosus, and superficial and deep transverse perinei.

Published pathological tissue studies associate a neuroproliferative subtype of provoked vestibulodynia with vestibular hyperinnervation.[10] In six vestibulectomy specimens from diagnosed patients, Tomalty et al. observed PGP9.5-positive nerve-fiber and mast-cell proliferation; increased VIP- and TH-positive fibers appeared in one sample.[9]

Vascular Supply​

Dual supply:[1][6][8]

  • Internal pudendal artery (internal iliac). Via perineal branches; gives deep (cavernosal) and dorsal arteries of the clitoris, posterior labial arteries, and perineal branches. The dominant supply.
  • External pudendal arteries (from the femoral). Supply mons and anterior labial skin; the axial vessels for Martius labial flaps.

The Martius labial fat-pad flap exploits the fact that the labium majus receives a reliable, bidirectional blood supply (external pudendal superiorly, internal pudendal inferiorly). The flap can be based on either pedicle depending on the defect (anterior fistula, mid-anterior-vaginal defect, urethral-wall reinforcement, etc.).

Venous drainage parallels the arteries to the internal and external pudendal veins.

Lymphatic drainage:

  • Most of the vulva drains to the superficial inguinal nodes, then deep inguinal and external iliac.
  • Clitoris and anterior labia can drain bilaterally. A non-lateralized invasive vulvar tumor requires bilateral groin evaluation, though not automatically bilateral complete lymphadenectomy. For primary unifocal tumors >T1a and <4 cm without suspicious inguinofemoral nodes on clinical examination and imaging, ESGO recommends sentinel-node mapping (grade B), with bilateral sentinel-node detection required for tumors involving the midline.[12]
  • Deep inguinal (Cloquet's) node is the uppermost deep inguinal node beneath the inguinal ligament, connecting groin drainage to external-iliac pathways; sentinel nodes are identified by tumor-specific mapping.[18]

Fascial Continuity — Why Hematomas, Infection, and Fournier's Spread Predictably​

The superficial fascia of the labia is continuous with Colles' fascia of the perineum and Scarpa's fascia of the anterior abdominal wall. A collection in this superficial plane can extend toward the lower abdominal wall; fascial attachments limit spread onto the thigh and posteriorly. Necrotizing infection can breach normal compartment boundaries, so these planes cannot be used to rule out deeper extension.[13] This is relevant to:

  • Vulvar hematoma (obstetric, post-traumatic) with possible extension into connected superficial planes
  • Fournier's gangrene of the vulva spreading along superficial fascia but potentially beyond a single compartment
  • Extravasation of urine after some urethral injuries within the superficial perineal space, depending on the level and tissue planes disrupted

The labium majus is the female homolog of the scrotum, with similar fascial compartmentalization.

Glands of the Vestibule​

GlandLocationClinical correlate
Bartholin (greater vestibular)Paired; openings at 5 and 7 o'clock of the vaginal introitusCyst/abscess may be managed with a Word catheter or marsupialization; a persistent, solid, atypical or new peri-/postmenopausal Bartholin-area mass warrants assessment for malignancy and appropriate tissue diagnosis. Cancer management is stage-specific.[14]
Skene (lesser vestibular / paraurethral)Alongside urethral meatusSkene gland cyst / abscess; thought to be the origin of many adult urethral diverticula, and the origin of Skene gland carcinoma

Physiological Functions (kept brief)​

  • Sensation and sexual response. Parasympathetic activation causes vasodilation and engorgement of clitoral body, crura, and vestibular bulbs; labia minora engorge and redden. The glans clitoris has high sensory nerve density, and preserving its innervation is intended to protect arousal and orgasm.
  • Glandular secretion. Bartholin glands contribute a minor fraction of lubrication under parasympathetic drive; Skene glands produce a periurethral secretion.
  • Protection and structural closure. Labia majora close the urogenital cleft at rest; the perineal body anchors the superficial perineal musculature and is a load-bearing structure of the pelvic floor.

Embryology (compressed)​

In typical female and male development, the external genitalia arise from four homologous structures: the genital tubercle (clitoris or glans penis), urogenital folds (labia minora or ventral penile shaft), labioscrotal swellings (labia majora or scrotum), and urogenital sinus (vestibule and urethra versus prostatic and membranous urethra).[4] The resulting homologies are clinically relevant for:

  • Disorders of sex development (DSD) and the vocabulary of feminising or masculinising genitoplasty.
  • Gender-affirming genital surgery, where labia majora and scrotum, clitoris and glans, and vestibule and urethra serve as each other's source tissues in reconstruction.
  • Reconstruction after female genital mutilation (FGM). Clitoral reconstruction exploits the preserved subcutaneous clitoral body / crura deep to the scarred glans.

Clinical Correlations for the Reconstructive Surgeon​

  • Vestibulodynia and vestibulectomy. Localized provoked vestibular pain is managed with an individualized, often multidisciplinary approach. If nonsurgical approaches have failed and pain is localized to the vestibule, vestibulectomy may help selected patients.[9][10][15] Excision is limited to painful tissue.[15] Bartholin cysts were reported in up to 9% of cases in the heterogeneous surgical series for provoked vulvodynia reviewed by Saçıntı et al.[27]
  • Bartholin pathology. Acute abscess is treated with Word catheter or marsupialization; recurrent cysts with marsupialization, CO₂ laser, or excision. A new Bartholin-area mass in a postmenopausal patient warrants malignancy assessment; the cited review advises generous consideration of biopsy after menopause and biopsy for persistent, progressive, solid or invasive lesions.[14]
  • Urethral-diverticulum access. Diverticula are thought to arise from obstructed periurethral glands and may present as an anterior vaginal wall mass or with urinary symptoms. Transvaginal excision raises a well-vascularized vaginal flap, preserves periurethral fascia, removes the sac and ostium, closes the urethra watertight over a catheter, then closes periurethral fascia and vaginal wall in nonoverlapping layers. Martius interposition is considered for poor tissue quality or complex repair.[20]
  • Martius labial fat-pad flap. A vascularized interposition option for:
    • Vesicovaginal and urethrovaginal fistula repair
    • Urethral diverticulectomy reinforcement
    • Complex perineal wound coverage Harvested through a vertical labia-majora incision based either on the posterior labial branch of the internal pudendal (inferiorly pedicled) or on the external pudendal (superiorly pedicled); choice depends on the destination defect.
  • Clitoral reconstruction. After FGM/C (scar release and mobilization of the residual clitoral body)[26], after oncologic resection, or as part of gender-affirming surgery (metoidioplasty / vaginoplasty). Preserving the dorsal nerve of the clitoris is a limiting technical step in all of these.
  • Vulvar SCC. The predominant vulvar malignancy has HPV-associated and HPV-independent pathways. Local surgery and groin management depend on invasion, size, focality, laterality and nodes; sentinel-node evaluation is recommended for eligible unifocal tumors <4 cm without suspicious groin nodes, with bilateral mapping for midline lesions. Larger or multifocal invasive disease generally requires inguinofemoral lymphadenectomy; treatment belongs in a gynecologic-oncology team.[12]
  • Vulvar lichen sclerosus (LS). This chronic inflammatory dermatosis can cause introital narrowing and clitoral-hood fusion; urethral stricture is uncommon in women. LS is associated with HPV-independent vulvar SCC. EuroGuiDerm strongly recommends potent or ultrapotent topical corticosteroids and suggests de-adhesion or perineoplasty for persistent introital stenosis that impairs voiding or intercourse despite steroid treatment. Described repairs include clitoral de-hooding, tension-free vaginal advancement, and, in selected cases, double opposing Z-plasty with V-Y advancement or vaginal epithelial grafts. Continue topical treatment after surgery.[23]
  • Obstetric anal sphincter injury (OASIS) and perineorrhaphy. 3rd-degree (sphincter involvement) and 4th-degree (rectal mucosa) tears destroy the converging structures of the perineal body. Repair rebuilds external anal sphincter, internal anal sphincter (when disrupted), and the perineal-body convergence of bulbospongiosus and transverse perinei.
  • Female genital reconstruction after cancer therapy. Post-radiation vulvar stenosis and fistula are possible sequelae of pelvic-cancer treatment; reconstruction uses Martius, Singapore (pudendal-thigh) fasciocutaneous, gracilis, or VRAM flaps depending on defect size and irradiated bed.
  • Gender-affirming vulvoplasty and vaginoplasty. These operations use embryologically homologous tissues to construct the external vulva: a clitoris from glans tissue with its dorsal neurovascular pedicle preserved, labia majora from scrotal tissue, and a vestibule. Labia minora can use penile or preputial skin or urethral tissue. Vulvoplasty may be performed without a neovaginal canal; vaginoplasty creates a canal lined with penile or scrotal skin, peritoneum, or bowel, depending on the technique.[21][22]
  • Vulvar hematoma and Fournier's. Superficial fascial continuity helps anticipate some spread. Necrotizing infection may cross compartment boundaries, so the actual extent is assessed directly and the perineal membrane is not treated as an absolute barrier.[13] For a tense hematoma threatening the overlying skin, evacuation through a small incision at the most dependent point with a drain secured to the skin edges, combined with periodic external compression to promote continued drainage, has been described; exploration for a discrete bleeding vessel is reserved as a last resort because clot and edema often obscure the source.[17]
  • Pudendal nerve block and entrapment. The ischial spine and sacrospinous ligament are landmarks for transvaginal or transperineal block. Pudendal injury or entrapment can occur at several sites and may cause neuropathic vulvar, clitoral, or perineal pain. EAU strongly recommends standard neuropathic-pain management; decompression is an option in selected refractory cases with a clear diagnosis, but residual symptoms may persist.[24]

References​

1. Golden E, Cooke S, Butler E, Gregg L, Gomez E. "Under the Hood: Vulvar Anatomy and Pathology With a Focus on MRI." Abdom Radiol (NY). 2026;51(4):2106–2124. doi:10.1007/s00261-025-05179-1

2. Yeung J, Pauls RN. "Anatomy of the Vulva and the Female Sexual Response." Obstet Gynecol Clin North Am. 2016;43(1):27–44. doi:10.1016/j.ogc.2015.10.011

3. Committee on Practice Bulletins—Obstetrics. "ACOG Practice Bulletin No. 198: Prevention and Management of Obstetric Lacerations at Vaginal Delivery." Obstet Gynecol. 2018;132(3):e87–e102. doi:10.1097/AOG.0000000000002841. Interim update; reaffirmed 2025.

4. Puppo V. "Embryology and Anatomy of the Vulva: The Female Orgasm and Women's Sexual Health." Eur J Obstet Gynecol Reprod Biol. 2011;154(1):3–8. doi:10.1016/j.ejogrb.2010.08.009

5. Kreklau A, Vâz I, Oehme F, et al. "Measurements of a 'Normal Vulva' in Women Aged 15–84: A Cross-Sectional Prospective Single-Centre Study." BJOG. 2018;125(13):1656–1661. doi:10.1111/1471-0528.15387

6. Tappy EE, Corton MM. "Anatomy of Sex: A Review of Critical Structures Within the Vulva and Vagina." J Minim Invasive Gynecol. 2026;33(1):3–9. doi:10.1016/j.jmig.2025.08.022

7. Jackson LA, Hare AM, Carrick KS, et al. "Anatomy, Histology, and Nerve Density of Clitoris and Associated Structures: Clinical Applications to Vulvar Surgery." Am J Obstet Gynecol. 2019;221(5):519.e1–519.e9. doi:10.1016/j.ajog.2019.06.048

8. Choi BJ, Chung MS, Chung BS. "Pudendal Nerve Identified on Sectioned Images of Female Cadaveric Pelvis." Urology. 2020;142:76–80. doi:10.1016/j.urology.2020.05.007

9. Tomalty D, Giovannetti O, Magliocchetti S, et al. "Characterizing the Innervation of the Vulvar Vestibule and the Immunohistochemical Features of Neuroproliferative Vestibulodynia." J Sex Med. 2023;20(6):716–731. doi:10.1093/jsxmed/qdad040

10. Velikonja L, Giovannetti O, Adams MA, Tomalty D. "Innervation of the Human Vulvar Vestibule: A Comprehensive Review." Clin Anat. 2023;36(1):18–27. doi:10.1002/ca.23966

11. Yucel S, De Souza A, Baskin LS. "Neuroanatomy of the Human Female Lower Urogenital Tract." J Urol. 2004;172(1):191–195. doi:10.1097/01.ju.0000128704.51870.87

12. European Society of Gynaecological Oncology. Vulvar Cancer Pocket Guidelines. 2023. Groin and sentinel-node recommendations, pp. 10–11.

13. Fahmy MW, Sanganeria T, Munakomi S. Anatomy, Abdomen and Pelvis: Superficial Perineal Space. StatPearls. NCBI Bookshelf. Updated 2022; accessed September 20, 2026.

14. Bartholin Gland Carcinoma: A State-of-the-Art Review of Epidemiology, Histopathology, Molecular Testing, and Clinical Management. 2025.

15. American College of Obstetricians and Gynecologists. Persistent Vulvar Pain. Committee Opinion 673. 2016.

16. Tubbs RS, Miller J, Loukas M, Shoja MM, Shokouhi G, Cohen-Gadol AA. "Surgical and Anatomical Landmarks for the Perineal Branch of the Posterior Femoral Cutaneous Nerve: Implications in Perineal Pain Syndromes. Laboratory Investigation." J Neurosurg. 2009;111(2):332–335. doi:10.3171/2008.11.JNS081248

17. Baggish MS. Vulvar Hematoma. In: Baggish MS, Karram MM, eds. Atlas of Pelvic Anatomy and Gynecologic Surgery. 5th ed. Elsevier; 2021:965–966.

18. Zivanovic O, Khoury-Collado F, Abu-Rustum NR, Gemignani ML. "Sentinel Lymph Node Biopsy in the Management of Vulvar Carcinoma, Cervical Cancer, and Endometrial Cancer." Oncologist. 2009;14(7):695–705. doi:10.1634/theoncologist.2009-0075

19. Asfour V, Digesu GA, Fernando R, Khullar V. "Ultrasound imaging of the perineal body: a useful clinical tool." Int Urogynecol J. 2020;31:1197–1202. doi:10.1007/s00192-019-04166-7

20. Greiman AK, Rolef J, Rovner ES. "Urethral diverticulum: A systematic review." Arab J Urol. 2019;17(1):49–57. doi:10.1080/2090598X.2019.1589748

21. Peters BR, Carboy JA, Richards H, Dy GW, Dugi D III. "Optimizing aesthetics in gender-affirming vaginoplasty and vulvoplasty: a narrative review and discussion based on over 600 cases of transfeminine vulvar construction." Transl Androl Urol. 2024;13(2):274–292. doi:10.21037/tau-22-681

22. Bene NC, Ferrin PC, Xu J, Dy GW, Dugi D III, Peters BR. "Tissue Options for Construction of the Neovaginal Canal in Gender-Affirming Vaginoplasty." J Clin Med. 2024;13(10):2760. doi:10.3390/jcm13102760

23. Kirtschig G, Kinberger M, Kreuter A, et al. "EuroGuiderm guideline on lichen sclerosus-Treatment of lichen sclerosus." J Eur Acad Dermatol Venereol. 2024;38(10):1874–1909. doi:10.1111/jdv.20083

24. European Association of Urology. EAU Guidelines on Chronic Pelvic Pain: Management. 2026. §§5.3.1, 5.4.7. Accessed October 7, 2026.

25. Tappy EE, Ramirez DMO, Carrick KS, Pruszynski JE, Corton MM. "Somatic and autonomic nerve density and distribution within the clitoris: an immunohistochemical study in adult female cadavers." Int Urogynecol J. 2024;35(7):1447–1456. doi:10.1007/s00192-024-05811-6

26. Auricchio V, Garzon S, Pomini P, et al. "Clitoral reconstructive surgery after female genital mutilation: A systematic review." Sex Reprod Healthc. 2021;29:100619. doi:10.1016/j.srhc.2021.100619

27. Saçıntı KG, Razeghian H, Bornstein J. "Surgical Treatment for Provoked Vulvodynia: A Systematic Review." J Low Genit Tract Dis. 2024;28(4):379–390. doi:10.1097/LGT.0000000000000834