Anatomical Structure and Location of the Lateral Cutaneous Nerve of the Thigh, Anterior View

Description

Running from the lateral border of psoas major across iliacus, the lateral cutaneous nerve of the thigh (lateral femoral cutaneous nerve, L2 to L3) is traced toward the anterior superior iliac spine and the inguinal ligament in an anterior male lower trunk and limb view. Near the ASIS the nerve passes deep to, or through, the inguinal ligament to enter the proximal anterolateral thigh, where it divides into anterior and posterior branches that spread over the skin of the lateral thigh. Surrounding landmarks include the iliac crest and anterior pelvis superiorly, the tensor fasciae latae and sartorius laterally and medially, and the femoral neurovascular bundle positioned more medial beneath the inguinal ligament. Bony reference points extend distally along the femur toward the patella, tibia, and fibula. This course matters because the nerve is vulnerable where it skirts the ASIS and crosses the inguinal ligament, the typical site of entrapment in meralgia paresthetica. Patients describe burning pain, paresthesia, and numbness over the anterolateral thigh without motor weakness, a pattern that helps distinguish it from L2 to L3 radiculopathy or femoral neuropathy. Surgeons also track this nerve during anterior approaches to the hip, iliac crest bone graft harvest, and placement of pelvic fixation, where traction or transection can produce persistent sensory symptoms. A small nerve, big consequences. Use this artwork for teaching lower limb cutaneous innervation in gross anatomy and regional anesthesia modules, and for illustrating meralgia paresthetica in neurology, pain medicine, sports medicine, or orthopedic texts. It also supports preoperative counseling and operative diagrams for hip arthroplasty and pelvic or inguinal procedures where the ASIS and inguinal ligament serve as primary surface landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.