Lower Extremity Nerves
The sensory and motor innervation of the entire lower extremity derives from the lumbosacral plexus. According to its clinical significance, the major nerves of this anatomic region include the sciatic, the femoral with the saphenous nerve, the tibial nerve, and the common fibular nerve. These nerves or some of their branches may be affected by blunt or sharp trauma and by compression/entrapment or tumors and tumor like lesions, such as nerve sheath tumors, schwannomas, and neurofibromas. Initial presumptive diagnoses of such lesions are based on clinical diagnostics, but high-resolution ultrasound (HRUS) proves high potential for a direct visualization and definition of relevant pathologies.