and gradual relaxation to a resting firing rate (static response).

Fusimotor system

While muscle spindles relay information via primary afferents, they receive descending efferent signals from the spinal cord via gamma motoneurons. This gamma innervation modulates the sensitivity of muscle spindle afferents to stretch. In cat studies, muscle spindle afferent firing rates with gamma fusimotor innervation were shown to be approximately equal to the sum of the gamma motoneuron firing

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