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September 1971

The Basis of Motor Control.

Arch Neurol. 1971;25(3):283-284. doi:10.1001/archneur.1971.00490030109020

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More than 25 years have elapsed since Leksell demonstrated that selective stimulation of small diameter fibers in ventral roots increases the discharge of muscle spindle afferent fibers without causing extrafusal muscle contraction. This finding, which demonstrated a separate motor control for muscle spindle receptors, initiated an enormous scientific effort to understand the properties of muscle spindles and their motor control. The result has been a considerable accumulation of knowledge about the behavior of spindles and the fusimotor gamma system regulating their behavior.

A leading contributor to the neurophysiology of the muscle spindle and its efferent control system, Ragnar Granit has written a new book providing an up-to-date summary of knowledge in the field. The book begins with an account of the morphological features of slow and fast muscle, the motor and sensory innervation of muscle, and the physiological properties of passive muscle spindles. It proceeds to an account of the

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