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The Penis

The penis has paired corpora cavernosa whose tunica, arterial inflow, veno-occlusive outflow control, and cavernous nerves support erection. The corpus spongiosum carries the urethra for urine and semen passage, while the dorsal nerves provide somatic sensation.[1][2][3][17]

Gross Anatomy and Fascial Layers​

The penis is composed of three erectile bodies: the paired corpora cavernosa (the rigidity engines) and the single midline corpus spongiosum (which surrounds the urethra and expands distally into the glans). Proximal attachments include the crura of the corpora cavernosa to the ischiopubic rami, the bulb of the corpus spongiosum to the perineal membrane, and the ischiocavernosus and bulbospongiosus muscles over each.[3] Thecorona overhangs the shaft, the ventral surface forms a "V" with the frenulum attaching just proximal to its point, and the meatus sits ventrally at the tip of the glans with a slit-like appearance.[3]

Penile mid-shaft sectionOriginal schematic · v2026-09-11 · Clinical review pending

Transverse mid-shaft section (dorsal up). The paired corpora cavernosa, each wrapped in tunica albuginea and carrying a central deep cavernosal artery, meet at the intercavernosal septum; the ventral corpus spongiosum carries the urethra. The deep dorsal vein lies near 12 o'clock, while the paired dorsal arteries and dorsal nerves course laterally beneath Buck's fascia[3] — the relationships that define the dissection planes for Peyronie's plaque surgery, prosthesis placement, and nerve-sparing. (Original WARWIKI schematic)

External layers (superficial to deep)​

LayerCompositionOperative relevance
SkinThin and mobile; shaft skin is usually hairless, but ventral skin near the raphe may carry hair[47]The mobile skin tube is the plane of degloving for circumcision, hypospadias repair, Peyronie's curvature repair, and skin-substitution urethroplasty
Dartos fasciaLoose subcutaneous tissue with smooth-muscle fibers and axial-pattern vessels from the external pudendal artery[3][4]The vascular plane for axial and island penile skin flaps (Orandi, Quartey, McAninch) in substitution urethroplasty; Blandy's urethroplasty uses a scrotal flap.[42]
Buck's fasciaDense fibroelastic envelope encircling all three erectile bodies; splits into two leaves ventrally around the corpus spongiosum[3][4][5]Carries the dorsal neurovascular bundle (dorsal artery, dorsal nerves, deep dorsal vein). Dissection under Buck's is the Peyronie's / curvature plane; dissection above Buck's is the circumcision / degloving plane
Tunica albugineaBilayered collagen jacket around each corpus cavernosum[6][7]The rigidity-bearing structure; the plane of corporotomy for penile prosthesis and of plication/incision for Peyronie's correction

The tunica albuginea — the key structural layer​

The tunica is bilayered:[6][7]

  • Inner circular layer. A complete 360° lamina with radiating intracavernous pillars (struts) that augment the septum and confer internal structural support.
  • Outer longitudinal layer. Incomplete, approximately 300° coat; absent ventrally between the 5- and 7-o'clock positions where the corpus spongiosum and urethra lie.[7] A Peyronie's plaque reduces local tunical extensibility and can bend the erect penis toward the involved side.[24]

Mechanical properties. The tunica is collagen-dominant with elastic fibers and is anisotropic.[8] In porcine tunica, type I collagen made up 95.5% of total protein, and Young's modulus was 60 MPa longitudinally vs 8 MPa circumferentially (six pigs).[8] The tunica has regional thickness differences in the cited developmental-anatomy work.[9] Plication shortens the convex side to balance the shorter plaque side; selection depends on erectile function, length and deformity.[24]

Why dissection planes matter. Three parallel dissection planes drive most open penile surgery:

  1. Above Buck's (subcutaneous / dartos). Degloving for circumcision, phalloplasty skin mobilization, hypospadias.
  2. Under Buck's, on the tunica. Peyronie's plication / incision, curvature correction, venous ligation.
  3. Into the tunica (corporotomy). Penile prosthesis insertion, evacuation of ischemic priapism, Peyronie's plaque excision with graft. Misidentifying these planes can injure the dorsal neurovascular structures or lead to implant malposition.

Ligamentous support​

The penis is suspended by two ligaments relevant to reconstructive surgery:

  • Fundiform ligament. Superficial, from the linea alba to the penile dartos.
  • Suspensory ligament. Yiee and Baskin describe a suspensory-ligament extension of Buck's fascia attaching the penis to the pubis; in an eight-cadaver dissection, Danino et al. instead distinguished a loose suspensory band from the deeper dense vertical and arcuate attachments between pubis and tunica. Partial release of the fundiform and suspensory bands was described without destabilization in that cadaveric model.[3][35]

Erectile Tissue and Corporal Architecture​

The corpora cavernosa contain a three-dimensional network of endothelium-lined sinusoidal spaces separated by bundles of trabecular smooth muscle that insert at multiple points into the fibrous skeleton.[3][10] The two cavernosa communicate through the midline pectiniform septum, which is fenestrated in the pendulous penis and complete proximally near the crura.[6] The fenestrated pendulous septum permits communication between the two corpora.[6] During prosthesis insertion, crossover into the opposite corpus is a complication to recognize and correct.[33] The corpus spongiosum has the same sinusoidal architecture but thinner walls and larger sinuses, so it remains compressible during erection and does not occlude the urethra.

The subtunical venular plexus lies between the sinusoids and the tunica albuginea and is the mechanical substrate of veno-occlusion.[12]

Vascular Anatomy​

Arterial inflow​

The dominant supply is from the internal pudendal artery (a branch of the anterior division of the internal iliac). After giving off a perineal branch, the internal pudendal artery continues as the common penile artery, which gives rise to the dorsal, bulbourethral and cavernosal arteries on each side:[3][11][34]

ArteryCourseTerritory
Cavernosal (deep) arteryEnters the corpus cavernosum at the hilum; gives off helicine arteries that open into the sinusoidsFills the corpus cavernosum during erection
Dorsal penile arteryRuns under Buck's fascia on the dorsum, bracketed by the paired dorsal nerves and the deep dorsal veinSupplies skin, Buck's, and contributes to glans engorgement
Bulbourethral arteryPerineal; enters the bulb of the corpus spongiosumSupplies the corpus spongiosum, urethra, and glans

The three paired arterial systems have extensive anastomoses that inform partial-penectomy flap design. In posterior urethroplasty for pelvic fracture injury, division of the bulbar arteries can leave distal spongiosal perfusion dependent on retrograde flow from intact dorsal penile arteries through the glans; compromised penile inflow can cause urethral ischemia.[3][36] The external pudendal arteries (from the femoral system) supply penile skin and dartos and provide the axial vessels for distal-based skin flaps.[3][4]

Accessory pudendal arteries run above the pelvic diaphragm and can be dominant suppliers. In a meta-analysis of 23 studies (4,945 patients overall), separate pooled analyses estimated accessory pudendal artery prevalence at 28.5% and the three penile arterial supply patterns at 61.9% (internal pudendal alone), 32.8% (both arteries) and 5.4% (accessory artery alone).[31] The authors advocate preserving the vessel during radical prostatectomy when it is present, because its sacrifice could reduce penile arterial inflow.

Venous drainage​

Three drainage systems in parallel:[3][6][12]

  • Superficial. Superficial dorsal veins in the dartos, drain to the external pudendal / saphenous system.
  • Intermediate. Deep dorsal vein in the midline beneath Buck's fascia, fed by circumflex veins from the spongiosum and emissary veins piercing the tunica from the cavernosa.
  • Deep / proximal. Cavernosal and crural veins drain the proximal corpora into the internal pudendal venous system.

The subtunical venular plexus interposed between the sinusoids and the tunica is the hinge of the veno-occlusive mechanism (see below). Venous-ligation / dorsal-vein procedures for venogenic ED target the deep dorsal and circumflex drainage; long-term outcomes are poor, so the operation has largely been abandoned.

Innervation​

Penile innervation follows three systems, arriving in two functional compartments:[3][11][13][14][15][16]

SystemOriginNerveDestinationFunction
ParasympatheticS2–S4Pelvic → pelvic plexus → cavernous nervesHelicine arteries and trabecular smooth muscleErection (NO release)
SympatheticT10–L2Hypogastric → pelvic plexus → cavernous nervesTrabecular smooth muscleDetumescence and ejaculation (α-adrenergic)
SomaticS2–S4Pudendal → dorsal nerves of the penis (sensory) and perineal branches (sensory and motor)Penile skin and glans; ischiocavernosus and bulbospongiosusSensation and muscular expulsion of semen; emission is predominantly sympathetic[28][32]

The cavernous nerves — the clinically critical bundle​

The cavernous nerves are the largest branches of the inferior hypogastric (pelvic) plexus. They run along the posterolateral aspect of the seminal vesicles and prostate, cross the urogenital diaphragm with the membranous urethra, and ascend to the 1- and 11-o'clock positions on the bulbous urethra before piercing the tunica albuginea alongside the cavernosal artery.[11] They terminate on helicine arterioles and trabecular smooth muscle.

Two clinical implications:

  1. Nerve-sparing radical prostatectomy. Cavernous nerve pathways run close to the prostate and can be affected by thermal, traction and resection injury. Nerve preservation is relevant to erectile recovery, which varies with baseline function, age, cancer extent and technique.[23][27]
  2. Dual route to the corpora. Cavernous nerves reach the urethra and corpora along both a dorsal (along the seminal-vesicle / ejaculatory-duct axis) and a lateral (along the inferior vesical artery, forming the NVB) pathway.[15] The cadaveric authors advise saving both the dorsal and lateral roots, which were connected in about one third of specimens.

The dorsal nerves — anatomy of the DPN block​

The paired dorsal nerves course with the dorsal vessels near Buck's fascia. Landmark-based dorsal penile nerve blocks may use 10- and 2-o'clock infrapubic approaches, but techniques are not standardized, and the nearby vessels and corpora create injection hazards. Ultrasound can identify the target compartment just deep to Buck's fascia.[29]

Neurochemical organization​

Proximally, the intracavernous compartment is predominantly autonomic (nitrergic); distally, both extra- and intracavernous compartments are predominantly somatic, with intrapenile anastomoses carrying mixed fibers.[16] In a fetal immunohistochemical study, nNOS-positive cavernous nerve fibers joined the dorsal nerve at the penile hilum.[14]

Physiology of Erection​

Erection is a neurovascular event coordinating neural input, smooth-muscle relaxation, and a mechanical veno-occlusive switch.[1][2][17][19][20][21]

Flaccid state​

Tonic α-adrenergic sympathetic output contracts trabecular smooth muscle; cavernosal arteries are constricted, sinusoids are collapsed, and intracavernosal PₒO₂ is low (approximately 35 mmHg).

Tumescence​

Sexual stimulus activates pelvic-nerve parasympathetic output and withdraws sympathetic tone:

  1. NO release from nonadrenergic-noncholinergic (NANC) nerve terminals (neurogenic NO, from nNOS) and endothelium (endothelial NO, from eNOS).
  2. sGC activation raises cGMP in trabecular smooth muscle.
  3. Cytosolic Ca²⁺ falls, producing smooth-muscle relaxation of helicine arterioles and trabeculae.
  4. Sinusoids engorge with high-flow arterial blood; the corpora expand against the tunica albuginea.

Neuronal NO helps initiate erection, and both neuronal and endothelial NO can contribute to its maintenance; evidence for sustained nNOS signaling comes from animal experiments.[43]

Veno-occlusion — the mechanical switch​

As the sinusoids balloon, the subtunical venular plexus is compressed between the expanded sinusoids and the noncompliant tunica albuginea, shutting off emissary venous outflow. Intracavernosal pressure rises toward systolic blood pressure; intracavernosal PₒO₂ approaches arterial values.[12][17]

Rigid-erection phase​

Reflex contraction of the ischiocavernosus (and, transiently, bulbospongiosus) muscles at the crura drives intracavernosal pressure above systolic pressure, producing maximal axial rigidity during penetrative activity.

Detumescence​

Sympathetic activation (orgasm, ejaculation, or loss of stimulus) releases norepinephrine, constricting arterioles and contracting trabeculae. PDE5 hydrolyzes cGMP, terminating smooth-muscle relaxation. The subtunical venous channels reopen and venous drainage resumes in three phases (initial pressure rise, slow decline, rapid decline).[17][18][22] PDE5 inhibitors act by potentiating this pathway; they do not independently trigger erection, and sexual stimulation and intact neurogenic / endothelial NO release are still required.

Clinical Correlations for the Reconstructive Urologist​

  • Erectile dysfunction mechanisms (treatment drivers). Clinically useful ED phenotyping distinguishes arteriogenic (atherosclerotic inflow disease, often co-present with CAD), venogenic (venous leak) (inadequate veno-occlusion from tunical failure, large venous channels, or Peyronie's), neurogenic (post-prostatectomy, diabetes, SCI), smooth-muscle / endothelial (age-related or systemic vascular disease), and psychogenic. Selected studies report lower sildenafil response in duplex-defined venogenic than arteriogenic ED, and after non-nerve-sparing than nerve-sparing prostatectomy; intracavernosal injection, vacuum erection devices, and penile prosthesis are options when oral treatment is insufficient.[44][45][27]
  • Peyronie's disease. Focal tunica-albuginea fibrosis that may bend the penis toward the plaque. Surgery is considered for stable disease with intercourse-limiting deformity. Before selecting an operation for Peyronie’s disease, the EAU strongly recommends assessing palpable plaques, stretched or erect penile length, curvature on objective erection assessment, erectile function including response to pharmacotherapy when ED is present, and patient expectations; plaque location and complex deformity also inform procedure choice.[24]
    • Plication (Nesbit excision, 16-dot, or tunica plication) shortens the convex side. It is simple and preserves erectile function, but shortens the penis.
    • Tunical incision with grafting can minimize shortening for severe or complex deformity in patients with adequate erectile function; postoperative ED remains a material risk. A >60° threshold has been proposed but not validated as an absolute rule, and impaired erections are not an indication for grafting alone.[24]
    • Penile prosthesis with straightening if needed (modeling, plication, incision with or without graft), for Peyronie's with ED that does not respond to pharmacotherapy.[24]
  • Penile prosthesis. Corporotomy location varies with approach and corporal fibrosis. Lateral corporotomies near the 2- and 10-o'clock shaft positions are described for an infrapubic technique to avoid the dorsal neurovascular bundle and ventral urethra/spongiosum.[46] Dilation can cause proximal or distal perforation, urethral injury, or corporal crossover. A unilateral impasse calls for assessment of the tract and possible fibrosis; suspected crossover is checked and corrected by lateral redilation.[33]
  • Priapism: ischemic versus nonischemic.
    • Ischemic (low-flow). Rigid painful corpora, with corporal blood gas showing hypoxia and acidosis; a urologic emergency. AUA/SMSNA recommends intracavernosal phenylephrine and corporal aspiration, with or without irrigation, before surgery . If these measures fail, AUA/SMSNA recommends distal corporoglanular shunting, with or without tunneling ; a proximal shunt is not the mandatory next step. A prosthesis may be considered for untreated episodes >36 hours or failure of shunting, with or without tunneling .[30] Reassess persistent rigidity after shunting with blood gas or Doppler before reoperation .[25][30]
    • Nonischemic (high-flow). Often a post-traumatic arteriocavernosal fistula with nonischemic corporal blood gas; it is not an emergency. AUA/SMSNA supports initial observation ; EAU also describes perineal compression. For persistence after observation in a patient who wants treatment, AUA/SMSNA recommends embolization as first-line therapy .[25][30] Prolonged untreated cases can affect erectile function.[25]
  • Post-prostatectomy ED. Cavernous-nerve injury and vascular factors may contribute; baseline function, age and nerve preservation influence recovery. Pro-erectile treatment may start early for symptoms. Available evidence does not establish that any particular PDE5-inhibitor rehabilitation regimen restores spontaneous erectile function.[27]
  • Dorsal penile nerve block. Paired dorsal nerves are targets for infrapubic landmark or ultrasound-guided techniques. The 10- and 2-o'clock approach is one described option. It does not define a fixed injection depth, and the midline is not uniformly nerve-free.[29]
  • Penile trauma: fracture of the penis. Forcible bending of an erect penis may rupture the tunica albuginea, often with a popping sound, rapid detumescence and swelling; presentation varies. Urethral injury accompanies a subset (about 15% in the EAU summary, with a reported range of 1–38%). Blood at the meatus, hematuria or impaired voiding heighten concern, but their absence does not exclude urethral injury. EAU recommends excluding urethral injury in penile fracture ; visible hematuria requires retrograde urethrography, and intraoperative flexible cystoscopy can assess suspected injury. Repair a confirmed tunical tear and any associated urethral injury; delayed presentation alone does not preclude exploration.[26]
  • Urethral reconstruction and flap design. Axial dartos vessels with external-pudendal supply and internal-pudendal collaterals can support penile skin flaps.[3][4] Subcoronal and hairless shaft skin are potential donor sites when skin quality and vascularity are adequate.[40] For lichen-sclerosus-related penile strictures, EAU recommends against genital-skin augmentation and describes oral mucosa grafting as a main strategy.[41] Harvest must preserve the dorsal neurovascular bundle and Buck's-fascia plane.[3]
  • Hypospadias and epispadias. In hypospadias, meatal position, urethral-plate quality, ventral curvature, and available coverage guide straightening and urethroplasty; TIP/Snodgrass, preputial onlay (Duckett), and Koyanagi variants suit different anatomies. Buck's-fascia-plane dissection and vascularized skin-flap design remain important for coverage. Epispadias is a dorsal urethral defect often accompanied by dorsal curvature and is repaired with distinct techniques such as modified Cantwell–Ransley or penile disassembly.[37][38]
  • Lymphatic drainage. Skin and prepuce have superficial lymphatic channels; the glans and erectile bodies also have deeper channels reaching the inguinal basin. In penile squamous-cell carcinoma, nodal spread proceeds through superficial and then deep inguinal nodes before ipsilateral pelvic nodes, with no observed direct pelvic drainage.[39] Nodal staging and dissection follow clinical risk and nodal findings.[39]

Videos​

Penile anatomy — lecture 1
Penile anatomy — lecture 2

References​

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