Pelvic Vascular Anatomy
Pelvic reconstruction depends on recognizing arterial pedicles, preserving tissue perfusion and anticipating the thin-walled veins crossing a dissection plane. Branching patterns, venous connections and the relationship of vessels to the ureter vary. A diagram or average cadaveric distance provides orientation; direct identification determines where dissection, ligation and fixation are safe.
This page covers the anatomical map. For bleeding and repair decisions, see Vascular Injury & Damage Control; for access, see Operative Exposure. Organ-specific companions include Bladder, Prostate, Uterus and Vagina.
Arterial supply
The common iliac artery divides near the pelvic brim into the external and internal iliac arteries; its vertebral level and relation to the ureter are variable. The external iliac passes beneath the inguinal ligament to become the femoral artery. The internal iliac supplies much of the pelvic viscera, pelvic wall, buttock and perineum.
The familiar anterior/posterior division pattern is a useful starting map, but shared trunks, absent branches and origins from another named artery occur. Anterior branches supply both visceral and parietal territories. Prostatic, vesical, vaginal, uterine and obturator origins should not be assumed from their names alone.[1][2]
Usual internal iliac branches
| Branch or group | Main territory and operative relationship |
|---|---|
| Superior vesical | Usually arises from the patent proximal umbilical artery and supplies the superior bladder. Identify the actual bladder pedicles; nerve-sparing surgery does not imply preservation of a cystectomy specimen's arterial supply. |
| Inferior vesical / prostatic branches | Supply the bladder base, prostate and adjacent structures in men. Origins and pedicle relationships vary; nearby autonomic nerves are not contained within the artery. |
| Vaginal branches | Supply the vagina and contribute to adjacent bladder/urethral circulation; communicate with uterine and pudendal branches. |
| Uterine | Supplies the uterus and cervix with ascending, descending and adnexal connections. Crosses above the ureter near the cervix. |
| Middle rectal | Variable contribution to the rectum, sometimes absent; communicates with superior and inferior rectal territories. |
| Obturator | Reaches the medial thigh through the obturator canal. It may arise from, or communicate with, the external iliac/inferior epigastric system over the superior pubic ramus. |
| Internal pudendal | Leaves below piriformis through the greater sciatic foramen, passes around the ischial spine/sacrospinous ligament and re-enters through the lesser sciatic foramen. Its branches supply the perineum, erectile tissues and lower anal canal. |
| Inferior gluteal | Usually an anterior-division branch, exiting below piriformis to the buttock. |
| Iliolumbar | Usually posterior division; supplies iliacus, psoas and adjacent lumbar structures. |
| Lateral sacral | Usually posterior division; supplies sacral and foraminal structures. |
| Superior gluteal | Usually posterior division; exits above piriformis to the gluteal region. |
The pudendal course and vulvovaginal anastomoses are described in the reconstructive anatomy review; the corona mortis requires separate attention below.[2][3]
Arteries entering from outside the internal iliac system
- Gonadal arteries: usually arise from the abdominal aorta. The ovarian vessels reach the adnexa in the infundibulopelvic ligament; the testicular vessels descend toward the deep inguinal ring and spermatic cord. The ovarian artery communicates with the uterine artery near the adnexa and uterine cornua.
- Superior rectal artery: continuation of the inferior mesenteric artery into the pelvis; supplies the rectum and contributes to the anal cushions through distal branches.
- Median sacral artery: usually arises from the posterior distal aorta and descends in front of the sacrum.
- External pudendal arteries: arise from the femoral system and supply anterior external genital tissues, with connections to internal pudendal branches. The labial fat pad has both superior external-pudendal and inferior internal-pudendal contributions. A commonly used inferiorly based Martius flap preserves the inferior pedicle; it is not an exclusively external-pudendal flap.[2][4]
Relationships that change the dissection
Ureter and pelvic pedicles
At the pelvic brim, the ureter crosses anterior to the iliac vessels, often around the common iliac bifurcation or external iliac artery. Trace it into the operative field rather than assuming the crossing is identical on both sides. Near the cervix, the uterine artery crosses over the ureter. The distance changes with anatomy, traction, prolapse, masses and previous surgery; a fixed centimetre measurement is not a safe ligation rule.
The same principle applies around the prostate: vascular pedicles and cavernous nerve pathways are close and variable. Cutting close to an organ does not by itself guarantee nerve preservation. Use the relevant organ-specific dissection plane and account for scarring or oncologic requirements.
Corona mortis
Corona mortis describes arterial and/or venous connections between the obturator and external iliac/inferior epigastric systems over the superior pubic ramus. Venous connections are particularly important. It is not synonymous with an accessory obturator artery alone.[3]
A 2020 systematic review of 13 anatomical/imaging/operative studies, comprising 1,455 hemipelves, estimated an overall prevalence near 46%, with marked between-study heterogeneity. The practical lesson is to anticipate a crossing vessel, not to apply a single prevalence or distance as a safe zone. Inspect the retropubic surface during Burch, hernia, fracture and other dissections near Cooper's ligament; preserve or deliberately control a vessel that must be divided before traction tears it.[3]
Collateral arterial circulation
| Connection | Systems linked |
|---|---|
| Superior ↔ middle/inferior rectal | Inferior mesenteric ↔ internal iliac/pudendal |
| Ovarian ↔ uterine | Aortic gonadal ↔ internal iliac |
| Lumbar ↔ iliolumbar | Aorta ↔ internal iliac |
| Median ↔ lateral sacral | Aorta ↔ internal iliac |
| Gluteal ↔ femoral/circumflex branches | Internal iliac ↔ femoral/profunda circulation |
| Obturator ↔ inferior epigastric/external iliac | Internal ↔ external iliac systems |
Collateral flow can preserve tissue after interruption of an arterial route, but does not make internal iliac ligation or embolization free of ischemic risk. Shock, atherosclerosis, prior embolization, radiation and previous surgery can change the available circulation. Preserve or reconstruct important inflow when feasible; the hemorrhage-control decision belongs in the vascular management pathway.[1]
The uterine–ovarian connection also matters during arterial embolization: residual supply and non-target passage depend on the patient's vascular map.
Venous anatomy
Pelvic visceral plexuses communicate extensively with one another, the iliac systems, gonadal veins and vertebral/paravertebral channels. Many plexiform channels lack effective valves, but it is incorrect to call every pelvic or gonadal vein valveless. Venous variants and collateral recruitment can be substantial, especially with obstruction or reflux.[5]
Vesical and prostatic plexuses
The vesical and prostatic venous plexuses communicate around the bladder and prostate and drain toward the internal iliac system. The deep dorsal penile vein connects with the prostatic plexus; the dorsal venous complex is important during anterior/apical prostate dissection. Its control must be coordinated with preservation of the urethra and adjacent structures. The timing and method vary by operative technique; there is no universal rule requiring one method before every urethral transection.[5]
Uterine, vaginal and ovarian veins
The uterine and vaginal plexuses communicate across the pelvis and drain through uterine/vaginal veins into the internal iliac systems, with additional connections to the ovarian veins. The right ovarian vein usually drains to the IVC and the left to the left renal vein; duplicated trunks and variant junctions occur. Valves may be absent or incompetent, but cross-pelvic and gonadal–iliac communications are present.[5]
Dilated pelvic veins or an anatomical compression on imaging do not alone establish the cause of pelvic pain. When a pelvic venous disorder is being evaluated, correlate symptoms with reflux, obstruction and collateral pathways. Venous embolization addresses selected abnormal venous pathways; uterine artery embolization is an arterial treatment and is not an extension into a venous plexus to treat ordinary pelvic varices.[5]
Pampiniform and testicular drainage
The pampiniform plexus surrounds the testicular artery within the spermatic cord and participates in heat exchange. The right testicular vein usually drains to the IVC and the left to the left renal vein. These asymmetrical outflow routes, valve function and venous pressure help explain the predominance of left varicocele. The angle of a junction alone neither diagnoses nutcracker syndrome nor determines treatment. See Testicles & Scrotum.[5]
Presacral and vertebral plexuses
The presacral network includes median/lateral sacral veins and connections with veins entering the sacral foramina and vertebral system. Injury can cause major hemorrhage, and traction or blind attempts to clamp a retracted vessel can enlarge the defect. The left common iliac vein may be close to the promontory; expose the intended fixation site before placing sutures. Cadaveric averages do not establish a universally avascular square.[5][6]
Start control with directed pressure and exposure, then use a source-specific repair or hemostatic strategy with appropriate help. Do not blindly drive a tack or instrument into a sacral foramen. Detailed relationships are in The Presacral Space; active bleeding management is in Vascular Injury & Damage Control.
The vertebral venous plexus permits communication with pelvic veins and offers a potential route for tumor or infection spread. This anatomical connection is not proof that all vertebral metastases from pelvic cancers follow a single route.[5]
Iliac veins
The external iliac vein is generally medial to its artery in the distal pelvis, while more proximal relationships and tributaries vary. The left common iliac vein passes beneath the right common iliac artery; compression here can become clinically relevant, but an imaging appearance alone does not establish symptomatic disease.[5]
Unexpected tributaries can cross a lateral or presacral dissection. One descriptive study examined 40 iliac venous systems in 20 cadavers and found presacral external-iliac tributaries in 20 systems from 15 cadavers. Its 75% figure refers to cadavers, not to all venous systems or a proven population prevalence. Anticipate these branches during exenteration, sacrectomy and lateral pelvic surgery rather than assuming the external iliac vein has no local tributaries.[7]
Lymphatic orientation
Lymphatic drainage is regional, overlapping and sometimes bilateral. The nodal basin associated with an organ is not itself a surgical lymphadenectomy template: cancer-specific staging, mapping and the patient's previous treatment determine that plan.
| Territory | Useful orientation |
|---|---|
| Penis | Inguinal drainage can be bilateral. In penile cancer, the usual progression is superficial then deep inguinal nodes, followed by ipsilateral pelvic nodes; the glans should not be presented as routinely bypassing the groin. |
| Male anterior urethra | Superficial/deep inguinal drainage, then pelvic nodes; use the lesion's exact location in staging. |
| Male posterior urethra | Pelvic nodal drainage. |
| Female urethra | Proximal third drains toward pelvic nodes; distal two-thirds toward superficial/deep inguinal nodes. |
These are the current EAU guideline descriptions, not operative dissection boundaries. Gonadal drainage accompanying the gonadal vessels toward retroperitoneal nodes differs from the predominantly inguinal drainage of external genital skin; see the organ-specific anatomy pages for further detail.[8][9]
References
1. Wahlgren CM, Aylwin C, Davenport RA, et al. European Society for Vascular Surgery (ESVS) 2025 clinical practice guidelines on the management of vascular trauma. Eur J Vasc Endovasc Surg. 2025;69:179–237. doi:10.1016/j.ejvs.2024.12.018.
2. Yavagal S, de Farias TF, Medina CA, Takacs P. Normal vulvovaginal, perineal, and pelvic anatomy with reconstructive considerations. Semin Plast Surg. 2011;25:121–129. doi:10.1055/s-0031-1281481.
3. Noussios G, Galanis N, Chatzis I, et al. The anatomical characteristics of corona mortis: a systematic review of the literature and its clinical importance in hernia repair. J Clin Med Res. 2020;12:108–114. doi:10.14740/jocmr4062.
4. Wilson A, Pillay S, Greenwell T. How and why to take a Martius labial interposition flap in female urology. Transl Androl Urol. 2017;6(Suppl 2):S81–S87. doi:10.21037/tau.2017.04.38.
5. Zurcher KS, Staack SO, Spencer EB, et al. Venous anatomy and collateral pathways of the pelvis: an angiographic review. Radiographics. 2022;42:1532–1545. doi:10.1148/rg.220012.
6. Wieslander CK, Rahn DD, McIntire DD, et al. Vascular anatomy of the presacral space in unembalmed female cadavers. Am J Obstet Gynecol. 2006;195:1736–1741. doi:10.1016/j.ajog.2006.07.045.
7. Kanjanasilp P, Ng JL, Kajohnwongsatit K, et al. Anatomical variations of iliac vein tributaries and their clinical implications during complex pelvic surgeries. Dis Colon Rectum. 2019;62:809–814. doi:10.1097/DCR.0000000000001335.
8. European Association of Urology. Penile cancer guideline. 2026. Regional lymphatic drainage and management.
9. European Association of Urology. Primary urethral carcinoma guideline. 2026. Diagnostic evaluation and staging.