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Quarterly Journal of Experimental Physiology and Cognate Medical Sciences 47.4 pp 324-333
© The Physiological Society 1962
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THE DIFFERENTIATION OF TWO TYPES OF FUSIMOTOR FIBRE BY THEIR EFFECTS ON THE DYNAMIC RESPONSE OF MUSCLE SPINDLE PRIMARY ENDINGS

P. B. C. Matthews 1

1 University Laboratory of Physiology, Oxford

Ventral root filaments were subdivided until they contained a single ggr motor fibre to the soleus muscle of the anæsthetized cat. The response of a muscle spindle primary ending to a standard stretch was observed during repetitive stimulation of such single ggr fibres. All ggr fibres isolated increased the discharge of the ending when the muscle was at a constant length; but some ggr fibres (here called dynamic fusimotor fibres) in addition increased the sensitivity of the ending to the dynamic stimulus of stretching; in contrast, others (static fusimotor fibres) tended to decrease the dynamic sensitivity. These two different effects could be produced on the same primary ending by different ggr fibres. These differences were independent of the frequency of stimulation, the amplitude of stretch and the velocity of stretching. No other consistent differences were found between the two kinds of fusimotor fibre.

Note:

I should like to thank Mr. E. T. Giles for assistance in setting up the preparations and Mr. A. Wragg for assistance with the apparatus. Dr. R. H. Kay and Mr. W. J. Bannister most kindly designed and made a transistorized current amplifier to supply the vibrator.

Submitted on June 14, 1962




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