External Boundaries of the Uterine Blood Network

Description

Along the lateral walls of the uterus, the uterine arteries course medially within the base of the broad ligament, then ascend in a tortuous path toward the fundus while giving off arcuate branches that wrap circumferentially through the myometrium. Inferiorly, cervical and vaginal branches concentrate around the cervix and upper vagina, with a dense plexus near the lateral fornices. Superiorly, the uterine artery’s terminal segments meet the ovarian artery near the uterine cornu, forming fundal anastomoses adjacent to the proximal uterine tube. Caliber changes matter here. Clinically, this boundary-level map of uterine blood supply helps when you need to predict collateral flow after uterine artery ligation, embolization, or postpartum hemorrhage control, because the utero-ovarian anastomosis can maintain perfusion to the fundus even when proximal uterine flow is reduced. The cervicovaginal plexus is a different problem, bleeding from low uterine or cervical sources often persists unless you address vaginal branches and their cross-midline communications. Surgeons also use these relationships when developing the vesicouterine and rectouterine spaces during hysterectomy, where the uterine artery crosses the ureter near the cervix before turning superiorly. Use this artwork in obstetrics and gynecology teaching blocks on uterine anatomy, in interventional radiology material on uterine artery embolization and variant collateralization, or in surgical atlases that discuss hysterectomy, trachelectomy, and postpartum hemorrhage algorithms with attention to fundal versus cervical bleeding sources. Anatomical accuracy verified by SciePro's Medical Advisory Board.