THE RECORDING OF NERVE ACTION POTENTIALS THROUGH SKIN IN MAN

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Abstract
Action potentials of useful size may be recorded from the skin over the more superficial parts of the median and ulnar nerves near the elbow. Recording electrodes 1 cm. apart curved to fit the nerve must be placed with 1 cm. accuracy. Stimulation at the wrist causes an immediate shock artifact lasting 1.5-2 msecs. and is followed 3-4 msecs. later by a triphasic wave lasting 3 msecs., which increases with the stimulation up to the strength required for maximal stimulation. The stimulation must be over the nerve to produce the triphasic wave, which reaches 70% of maximum when the impluse is still infrathreshold for motor fibers. Recorded conduction velocities are within the accepted values of Helmholtz and Baxt.

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