Diagram depicting the pelvic arterial system, overlaid on a pelvic angiogram. The common iliac artery is shown in aqua; the external artery, in yellow; the internal iliac artery, in green; the posterior branch of the internal iliac artery, in red; and the anterior branch of the internal iliac artery, in blue. Smaller vessels include the superior gluteal artery (1), iliolumbar artery (2), lateral sacral artery (3), inferior gluteal artery (4), umbilical artery (5), obturator artery (6), internal pudendal artery (7), medial rectal artery (8), uterine artery or ductus deferens (9), and superior vesical artery (10).