Relations between sensory symptoms, touch sensation, and sensory neurography in the assessment of the ulnar neuropathy at the elbow

Differences in biophysical properties of sensory and motor axons make the former more predisposed to the injury by the identical mechanical stress (Lin et al., 2002). In addition, cutaneous afferents appear to depend more on Na+/K+ pump action than motor fibers to keep resting membrane potentials (Burke et al., 1997; Kiernan et al., 2004). Therefore, sensory axons show greater tendency to develop ectopic activity than motor axons. Accordingly, the entrapment nerve syndrome generally presents sensory symptoms in the cutaneous territory of the injuried nerve as the first complaint.

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