Pareses of an extremity analyzed by strength testing of individual muscle groups usually allows for a rapid classification of the locus of disease to nerve root, plexus, or peripheral nerve. Additional clues are provided by accompanying disturbances of sensory function and testing of reflexes.
When testing sensory function, the examiner has to rely on the attention and cooperation of the patient. A thorough testing of the most important sensory modes can be time-consuming (■ Tables 21.11 and 21.12).
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