Anatomical Structure and Location of the Obturator Nerve

Description

Arising from the anterior rami of L2 to L4 within the lumbar plexus, the obturator nerve tracks inferiorly along the medial border of psoas major and enters the lesser pelvis. It runs on the lateral pelvic wall superior to the obturator vessels, then passes anteroinferiorly through the obturator canal to emerge on the medial thigh. Distal to the canal, anterior and posterior branches separate around adductor brevis, with the posterior division coursing between adductor brevis and adductor magnus. Bony landmarks include the ilium, pubis, ischium, femur, tibia, and fibula, with major lower limb nerve trunks drawn in relation to the spine and hip joints. Medial thigh pain and adductor weakness often trace back to this pathway. Entrapment at the obturator canal, pelvic fracture, or hematoma along the pelvic sidewall can produce burning pain radiating to the groin and medial thigh, reduced hip adduction, and an absent or diminished adductor reflex, while sparing knee extension because the femoral nerve remains intact. During pelvic lymphadenectomy and obturator node dissection, the nerve lies in close proximity to obturator vessels and the obturator internus fascia, so this perspective helps you teach safe planes and the expected motor deficit when the nerve is stretched or transected. A clean landmark. Use this illustration in gross anatomy lab manuals, neuroanatomy and pelvic surgery lectures, and clinical teaching on obturator neuropathy, regional anesthesia (obturator nerve block), and postoperative gait changes after pelvic procedures. It also fits well in orthopedic and sports medicine content addressing adductor-related groin pain and differential diagnosis versus femoral or lumbosacral radiculopathy. Anatomical accuracy verified by SciePro's Medical Advisory Board.