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Mononeuropathies and Entrapment Syndromes 

Mononeuropathies and Entrapment Syndromes
Chapter:
Mononeuropathies and Entrapment Syndromes
Author(s):

Jun Kimura

DOI:
10.1093/med/9780199738687.003.0025
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date: 13 June 2021

This chapter discusses mononeuropathies and entrapment syndromes. The diagnosis of a focal nerve lesion depends on elucidation of weakness and atrophy of all muscles supplied by the nerve distal to the lesion. Sensory findings, which usually appear earlier, provide less reliable localizing signs than motor deficits in the upper limbs, where sensory dermatomes overlap considerably. Electrodiagnostic studies help localize and characterize a focal lesion. Stimulation above and below the suspected site of lesion may document only a localized slowing of conduction or changes in amplitude and area of the muscle or nerve action potential as indices of functional block. Needle studies delineate the exact distribution of denervated muscleaxonal degeneration, whereas a reduced recruitment of motor units signals a conduction blockin demyelinative conditions.

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