Differences between Autonomic and Somatic C fibres to Stimulation with Constant Currents.

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Abstract
Summary: Afferent and efferent unmyelinated fibres have been compared with respect to their tendency to react with repetitive impulse discharges to stimulation with constant currents.Stimulation with constant currents of the efferent C fibres in the lower part of the vagus nerve of the cat does not initiate a repetitive discharge with strengths up to more than 4 times the rheobase.On the other hand C fibres of dorsal root origin are extremely sensitive to stimulation with constant currents of just supra‐rheobasic strength.Peripheral vasodilatation can be elicited by local heating of the peripheral stump of the dorsal roots.The difference between the afferent and efferent C fibres with respect to stimulation by constant currents agrees with their differential thermal sensitivity.

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