Human leg lumbar plexus. It supplies motor innervation to iliopsoas, pectineus, sartorius, and quadriceps; and sensory branches to the anterior thigh, medial lower leg, and posterior foot. The nerves of the sacral plexus pass behind the hip joint to innervate the posterior part of the thigh, most of the lower leg, and the foot. The superior (L4-S1) and inferior gluteal nerves (L5-S2) innervate the gluteus muscles and the tensor fasciae latae. The posterior femoral cutaneous nerve (S1-S3) contributes sensory branches to the skin on the posterior thigh. The sciatic nerve (L4-S3), the largest and longest nerve in the human body, leaves the
Radial nerve skin between the thumb and index finger. Muscular branches of the radial nerve: Deep branch of the radial nerve: Posterior interosseous nerve (a continuation of the deep branch after the supinator): The radial nerve (and its deep branch) provides motor innervation to the muscles in the posterior compartment of the arm and forearm, which are mostly extensors. Injury to the radial nerve at different levels causes different syndromes with varying motor and sensory deficits. At the axilla At mid-arm Just below the elbow Within the distal forearm: Radial nerve The radial nerve is a nerve in the human body that