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The position of the upper limb is typical: the arm and forearm hang close to the side, with the forearm extended and pronated; the deltoid, spinati, biceps, brachialis, and supinators are paralysed, and in some cases the radial extensors of the wrist and the pronator teres are also affected. The patient is unable to supinate the forearm or to abduct the arm, and in most cases to flex the forearm.
The motor symptoms predominate, the muscles affected being the extensors of the wrist and fingers, and the supinators. If the hand and proximal phalanges are supported, the second and third phalanges may be partly extended by the interossei and lumbricals.
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