Human nerve excitability.

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Abstract
The excitabilities of separate fiber populations were examinedin the ulnar nerve in 75 healthy subjects, and in the posterior tibial, peroneal and sural nerves in 23 of these subjects. Square wave electric stimuli of varying duration were applied to the nerve in different locations, while recording the evoked muscle or nerve action potential. Threshold strength-duration curves were derived for motor, sensory and mixed nerve fiber populations. These curves did not vary significantly one from another, in upper vs lower extremity, or over time. No correlations between excitability and other measures of peripheral nerve function were observed. Excitability appears to reflect some element of nerve structure or function other than myelin.

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