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Electrical Properties of Nerve and Muscle 

Electrical Properties of Nerve and Muscle
Chapter:
Electrical Properties of Nerve and Muscle
Author(s):

Jun Kimura

DOI:
10.1093/med/9780199738687.003.0002
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date: 27 October 2021

The nervous system conveys information by means of action potentials, which, under physiologic conditions, originate in the cell body or axon terminal and propagate along the nerve fibers. An electrophysiologic study takes advantage of such neural impulses activated artificially by electrical stimuli applied at certain points of the nerve. In contrast to intracellular recording in animal experiments, clinical electrodiagnostic procedures analyze extracellular potentials by surface or needle electrodes. Here the interstitial tissues act as a volume conductor, where the position of the recording electrode relative to the generator source dictates the size and waveform of the recorded potentials. Understanding the electrical properties of nerve and muscle discussed in this chapter constitutes a prerequisite for a proper interpretation of electrodiagnostic data in the clinical domain.

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