GAMMA CONTROL OF DYNAMIC PROPERTIES OF MUSCLE SPINDLES

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Abstract
Cat muscle spindles with and without gamma control are studied by vibratory stimulation with blunt pin, electronically driven. Records from single fibers. Under gamma activation the spindle becomes tense owing to contractions of its muscular poles and so follows very much faster vibratory frequencies than it can do in the slack or deefferented state. Thus, though gamma activation in itself may be of slow onset, the excited spindle can respond to fast changes of movement (tension, elongation). Gamma activation thus controls the spindle in its capacity of detector of "change" transforming it from a slow to a fast instrument.

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