Flexion of the Thumb

Flexor Pollicis Longus: Anterior Interosseous Nerve, a Branch of the Median Nerve, C8

Hold the proximal phalanx of the patient's thumb between your finger and thumb. This provides a fixed base. Then have the patient flex the distal phalanx against resistance.

Figure 10-9. The forearm is supine and the dorsal surface is supported on the examining table. A. To test the flexor carpi radialis, the patient flexes and abducts the wrist. The tendon of the muscle is in the midvoiar aspect of the wrist at the arrow. B. To test the flexor carpi ulnaris, the patient flexes and abducts the wrist. The tendon is palpable on the medial aspect of the wrist at the arrow.

Figure 10-9. The forearm is supine and the dorsal surface is supported on the examining table. A. To test the flexor carpi radialis, the patient flexes and abducts the wrist. The tendon of the muscle is in the midvoiar aspect of the wrist at the arrow. B. To test the flexor carpi ulnaris, the patient flexes and abducts the wrist. The tendon is palpable on the medial aspect of the wrist at the arrow.

Flexor Pollicis Brevis Supply here is both median and ulnar, although it is most often ulnar only (Tl). The ambiguity of innervation makes examination unrewarding.

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