FACILITATION AND INHIBITION OF GAMMA EFFERENTS BY STIMULATION OF CERTAIN SKIN AREAS

Abstract
The influence of stimulation of the skin of the hind limb upon activity in efferent gamma fibers to the gastrocnemius and anterior tibial muscles of decerebrate-spinal cats was studied. With each muscle, efferent gamma activity was facilitated from the skin over the muscle and was inhibited from other areas. The influence of these skin reflexes upon alpha and gamma efferents, though qualitatively similar, differ in that the gamma motoneurons have a much lower reflex threshold.

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