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The accompanying illustrations are a guide for examining sensory and selected motor function of certain peripheral nerves: radial (Figure A-1), median (Figure A-2), ulnar (Figure A-3), fibular (peroneal) (Figure A-4), and femoral (Figure A-5). The sensory distribution of the lateral femoral cutaneous and obturator nerves is also shown (Figures A-6 and A-7). It is not intended to illustrate the findings of a lesion at any particular level of the nerves depicted. Sensory deficits may be less extensive than the full sensory field of a nerve because the fields of two nerves overlap, because a distal nerve lesion affects only part of the field, or because different sensory modalities are differentially involved.

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Figure A-1.
Graphic Jump Location

Testing the radial nerve. A: Sensory distribution. The radial nerve supplies the dorsolateral surface of the upper arm, forearm, wrist, and hand; the dorsal surface of the thumb; the dorsal surface of the index and middle fingers above the distal interphalangeal joints; and the lateral half of the dorsal surface of the ring finger above the distal interp halangeal joint. B: Extensor pollicis longus. The thumb is extended at the interphalangeal joint against resistance. C: Extensor pollicis brevis. The thumb is extended at the metacarpophalangeal joint against resistance. D: Extensor digitorum. The fingers are extended at the metacarpophalangeal joints against resistance. E: Abductor pollicis longus. The thumb is abducted (elevated in a plane at 90 degrees to the palm) at the carpometacarpal joint against resistance. F: Extensor carpi radialis longus. The wrist is extended toward the radial (thumb) side against resistance.

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Figure A-2.
Graphic Jump Location

Testing the median nerve. A: Sensory distribution. The median nerve supplies the dorsal surface of the index and middle fingers, the lateral half of the dorsal surface of the ring finger, the lateral two-thirds of the palm, the palmar surface of the thumb, index finger, middle fingers, and the lateral half of the palmar surface of the ring finger. B: Flexor digitorum profundus I and II. The index and middle fingers are flexed at the distal interphalangeal joints against resistance. C: Abductor pollicis brevis. The thumb is abducted (elevated at 90 degrees to the plane of the palm) at the metacarpophalangeal joints against resistance. D: Opponens pollicis. The thumb is crossed over the palm to touch the little finger against resistance.

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Figure A-3.
Graphic Jump Location

Testing the ulnar nerve. A: Sensory distribution. The ulnar nerve supplies the dorsal and palmar surfaces of the medial one-third of the hand, the dorsal and palmar surfaces of the little finger, and the dorsal and palmar surfaces of the medial half of the ring finger. B: Flexor digitorum profundus III and IV. The index and middle fingers are flexed at ...

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