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Intrinsic muscles of the hand


When the intrinsic muscles of the hand are affected,it is usually a lesion in the dorsal interossei. These muscles mainly abduct the fingers away from the
middle finger.There are four dorsal interossei and three palmar ones. The latter adduct the fingers towards the middle finger. These muscles can be tested by spreading the fingers against resistance followed by squeezing the examiner’s finger. The combination of positive answers indicates which muscle is affected.

The positioning is the same for all six tests.

When spreading the examiner applies resistance at the distal phalanges. During squeezing the examiner places his finger between the proximal interphalangeal joints.There are no common mistakes.

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