Femoral nerve anatomy

The femoral nerve (L2 to L4) emerges at the lower border between the psoas and iliacus muscles, and passes beneath the inguinal ligament. The femoral nerve provides motor branches to knee extensors (quadriceps muscles) and sensation to the anterior thigh, femur, knee joint, and medial leg. The saphenous nerve is the extension of the femoral nerve below the knee and is purely sensory.