Common Iliac Artery, Anterior View

Description

Anteriorly, the abdominal aorta is shown bifurcating at approximately the L4 level into right and left common iliac arteries, each coursing inferolaterally along the medial border of psoas major toward the pelvic brim. At the level of the lumbosacral junction, each common iliac artery divides into the internal iliac artery, turning posteromedially into the pelvis, and the external iliac artery, continuing anteroinferiorly beneath the inguinal ligament to become the femoral artery. Companion veins accompany this pathway, with the common iliac vein positioned posteromedial to the artery and converging superiorly to form the inferior vena cava. Iliacus and psoas major frame the vessels; elements of the ilium, pubis, and proximal femur provide bony orientation. This anterior perspective matters because the common iliac artery is short, fixed at the pelvic brim, and routinely encountered in vascular exposure and pelvic oncologic surgery. The relationship of artery to vein is a recurrent teaching point and a practical hazard during lymph node dissection and anterior approaches to the lumbosacral spine, where venous injury can be more problematic than arterial control. A classic clinical correlation sits just medial on the left, where the right common iliac artery can compress the left common iliac vein against the vertebral body (May-Thurner syndrome), predisposing to left iliofemoral deep vein thrombosis. Use this plate in gross anatomy and regional pelvic teaching to orient students to the aortic bifurcation, pelvic brim landmarks, and the internal versus external iliac branching logic. It also fits operative anatomy references for anterior lumbar interbody fusion (L4 to S1), pelvic trauma review, and endovascular planning discussions that reference common iliac landing zones and femoral access routes. Anatomical accuracy verified by SciePro's Medical Advisory Board.