Lumbar Artery, Posterior View

Description

Running segmentally from the abdominal aorta, the lumbar arteries course laterally across the vertebral bodies and then sweep posteriorly to reach the deep surface of the posterior abdominal wall. After passing behind the psoas major, each vessel travels between the transverse processes and the quadratus lumborum, then continues into the paraspinal compartment beneath the erector spinae. Overlying layers logically include the thoracolumbar fascia, latissimus dorsi inferiorly, and the medial mass of erector spinae adjacent to the spinous processes. Depth is the message. Posterior exposure of the lumbar vessels matters whenever you care about the segmental blood supply to the vertebrae, spinal canal, and posterior musculature. During posterior lumbar approaches, pedicle screw placement, or far-lateral decompression, the dorsal branch and accompanying veins can be a source of brisk bleeding when the intertransverse plane is developed too aggressively. The same segmental anatomy underlies retroperitoneal hemorrhage patterns after transverse process fractures, where injury to a lumbar artery can track into the psoas and paraspinal spaces. Educators can drop this plate into gross anatomy and regional back units to link deep back muscles to the vascular map that actually feeds them, and spine surgeons will recognize it as a clean reference for operative corridors around the transverse processes and thoracolumbar fascia. It also suits radiology and trauma publications that explain posterior abdominal wall hematoma on CT angiography or catheter angiography. Anatomical accuracy verified by SciePro's Medical Advisory Board.