Fig. 11-12. Testing finger movements. Upper, The use of a pinch to test the first dorsal interosseus and adductor pollicis. Adduction by the other interossei can be tested by having the subject hold a piece of paper between his fingers as the examiner tries to pull it away. Middle, The muscles of the thumb can be checked by palpating them as movements are made against resistance. Note the tenseness of the first dorsal interosseus of the examiner. Lower, the hypothenar muscles can be tested by abducting (or flexing) against resistance. Click for high resolution image.