TABLE 111.6 GUIDE TO THE NEUROLOGIC EXAMINATION OF THE DISTAL UPPER EXTREMITY A Motor function Nerve Muscles innervated Radial Extensor carpi radialis longus Ulnar Flexor carpi ulnaris Interosseous Median Flexor carpi radialis Flexor digitorum superficialis Opponens pollicis Anterior Interosseous B Sensory function Nerve Radial Ulnar Median Anterior Interosseous Motor examination Wrist extension Wrist flexion and adduction Finger spread Wrist flexion and abduction Flexion fingers at proximal interphalangeal joint Opposition thumb to base of little finger Flexor digitorum profundus Flexion distal phalanx of I and II index finger Flexor pollicis longus Flexion distal phalanx of thumb (test the strength when patient is making an “ok” sign) Sensory innervation Dorsal web space between thumb and index finger Ulnar aspect palm and dorsum of hand Little finger and ulnar aspect of ring finger Radial aspect palm of hand Thumb, index, middle, radial aspect ring finger None