External Arrangement of the Uterine Venous System

Description

Running along the lateral borders of the uterus, the uterine venous plexus forms broad, thin-walled collecting channels within the base of the broad ligament and around the cervix. Tortuous uterine veins emerge from this plexus near the cervico-isthmic region, course laterally and posteriorly with the uterine artery, and converge toward the pelvic sidewall to drain into the internal iliac vein. Superiorly, smaller venous connections extend along the uterine cornua toward the ovarian venous plexus, while inferior tributaries communicate with the vaginal venous plexus. Relationship is the point: veins sit medial to the internal iliac vessels and hug the uterus more closely than the ureter, which passes inferior to the uterine artery near the cervix. These external channels matter because they are a major source of brisk pelvic bleeding when the uterus is mobilized, clamped, or devascularized in hysterectomy and radical trachelectomy. Venous anatomy also explains postpartum hemorrhage patterns, since uterine atony leaves the uteroplacental bed drained by a low-pressure but high-capacitance plexus that can empty fast. Pelvic venous congestion and periuterine varices tend to cluster around the broad ligament and parametrial tissues illustrated here. Use this artwork for obstetrics and gynecology teaching on uterine hemodynamics, for surgical atlases describing ligation of uterine vessels and safe parametrial dissection, and for interventional radiology materials on uterine artery embolization where venous outflow and collateral pathways influence expected contrast washout. Anatomical accuracy verified by SciePro's Medical Advisory Board.