Abstract
Summary
Presence of spiking discharge in fibers of ventral roots leading from lumbosacral cord completely deafferented and transected at the L1 level is described. This activity was noted in adult cats either chronically or acutely prepared. On the bases of the small relative height of these spikes and the demonstration in afferent discharge from muscle spindles of tonic fusimotor influence, it is concluded that ventral root activity arises in gamma efferent fibers. Probably only a minor portion of gamma fibers present is participating.
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