Posterior Perspective of the Inferior Gluteal Nerve

Description

Arising from the anterior rami of L5 to S2 within the sacral plexus, the inferior gluteal nerve courses posteriorly through the greater sciatic foramen inferior to the piriformis. It runs lateral and slightly inferior to the pelvic sacral foramina, then travels deep to gluteus maximus with the inferior gluteal vessels, separating from the larger sciatic nerve as both enter the gluteal region. From this posterior perspective, the lumbosacral trunk, sacral plexus roots on the anterior surface of the sacrum, and the proximal sciatic nerve form the primary neural backdrop, framed by the ilium and ischium of the pelvic girdle. This is the nerve you care about when gluteus maximus stops working. Injury to the inferior gluteal nerve, from a posterior hip approach, pelvic trauma, or iatrogenic misplacement of an intramuscular injection in the inferomedial quadrant, produces weakness of hip extension and impaired rising from a seated position or climbing stairs, often without the sensory loss that accompanies sciatic neuropathy. The relationship to piriformis and the greater sciatic foramen is a surgical map. Use this artwork for teaching the sacral plexus in gross anatomy, neuroanatomy, and regional anesthesia modules, and for illustrating posterior hip arthroplasty, piriformis-related entrapment patterns, and safe injection-site education in nursing and sports medicine texts. Anatomical accuracy verified by SciePro's Medical Advisory Board.