<prompt> Median nerve injury at wrist, is commonly tested by-Contraction of abductor pollicis brevisContraction flexor pollicis brevisLoss of sensation on palmLoss of sensation on ring finger  <response>: Though the lateral three fingers, lateral half of ring finger and corresponding region of palm are supplied by median nerve, test for sensory loss by median nerve injury is done on the autonomous zone Tip of middle and index fingers.Flexion of thumb can also be produced by flexor pollicis longus. So for testing median nerve injury, abductor pollicis brevis is tested. 