Femoral Nerve, Lateral View

Description

Emerging from the posterior abdominal wall, the femoral (crural) nerve is traced from the lumbar plexus, typically with roots from L2 to L4, as it courses inferolaterally along the margin of psoas major and then passes deep to the inguinal ligament to enter the anterior thigh. A lateral perspective places the lumbar vertebrae and lumbosacral junction posterior to the iliac bone, with the acetabulum and femoral head forming the hip joint anterior to the sacrum and superior to the proximal femoral shaft. In the thigh, the nerve lies anterior to the hip capsule and proximal femur, then divides into multiple branches in the femoral triangle region, trending anteroinferiorly toward the level of the knee. Clear bony landmarks anchor the pathway. This angle matters when you need to teach or plan around the transition from lumbar plexus to peripheral nerve, where the femoral nerve can be injured by pelvic or retroperitoneal pathology. Iliopsoas hematoma in anticoagulated patients classically compresses the femoral nerve, producing anterior thigh pain, weakness of knee extension from quadriceps femoris involvement, and a reduced patellar reflex. Surgeons also reference this course during anterior approaches to the hip and during femoral arterial access, where the nerve lies lateral to the femoral vessels just below the inguinal ligament. Small distances. Real consequences. Ideal for anatomy and neuroanatomy instruction covering lumbar plexus organization, for orthopaedic and general surgery atlases illustrating exposure corridors near the inguinal region and hip, and for neurology teaching files correlating femoral neuropathy with exam findings and lesion localization from L2 to L4. Anatomical accuracy verified by SciePro's Medical Advisory Board.