Superior Cluneal Nerves, Posterior View

Description

Arising from the dorsal rami of the upper lumbar spinal nerves, the superior cluneal nerves emerge near the posterior iliac crest and descend inferolaterally across the upper gluteal region to supply cutaneous sensation over the superolateral buttock. Superficial to the thoracolumbar fascia and gluteus maximus, their branches traverse the posterior iliac crest region just lateral to the midline spinous processes and medial to the posterior superior iliac spine. A posterior male trunk is rendered with the vertebral column centered, paraspinal musculature flanking it, and the broad gluteus maximus occupying the inferior field. Nerve arborization is the focus. Clinically, this posterior topography matters because the superior cluneal nerves commonly become entrapped as they cross the iliac crest through an osteofibrous tunnel at the thoracolumbar fascia, producing superior cluneal nerve entrapment syndrome, a frequent mimic of lumbar radiculopathy. Pain localizes over the posterior iliac crest and radiates into the buttock, and a focal Tinel sign about 7 to 8 cm lateral to midline can reproduce symptoms. This view also supports procedural planning for diagnostic nerve blocks and surgical decompression, where precise surface projection relative to the iliac crest and posterior pelvic landmarks reduces missed targets. Faculty can drop this figure into low back pain teaching sessions in gross anatomy, regional anesthesia, or pain medicine modules to contrast cluneal neuropathy with L5 or S1 radiculopathy and sacroiliac joint pain. It also fits well in spine surgery or sports medicine publications discussing posterior iliac crest approaches, iliac bone graft harvest, and postprocedural neuropathic buttock pain. Anatomical accuracy verified by SciePro's Medical Advisory Board.