The effects of fusimotor stimulation during small amplitude stretching on the frequency‐response of the primary ending of the mammalian muscle spindle.

Single fusimotor fibres to the de‐efferented soleus of the anaesthetized cat were stimulated repetitively while recording the response of single primary afferents to small amplitude sinusoidal stretching at frequencies of 0‐5‐‐500 HZ. The response of the ending was determined by averaging its firing for many cycles to construct a 'cycle histogram'. When small enough, the stretching modulated the firing sinusoidally; as the frequency increased the requisite amplitude fell to a fraction of a micron. The amplitude of the modulation (in impulses/sec) divided by be amplitude of stretchin (in mm) gave the sensitivity of the ending for the particular frequency in question. 2. The passive frequency‐‐response curve obtained in the absence of fusimotor stimulation agreed with those obtained before...

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