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Related Experiment Videos

Disordered muscle tone and movement.

J W Lance

    Clinical and Experimental Neurology
    |January 1, 1981
    PubMed
    Summary

    This study explores motor system control over 30 years, differentiating muscle tone in Parkinson's disease, spasticity, and decerebrate rigidity. Key differences lie in stretch reflex release and flexor reflex afferent control by the brain stem.

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    Area of Science:

    • Neuroscience
    • Motor System Control
    • Physiology

    Background:

    • The author's research spans 30 years, focusing on the motor system.
    • Early work on the cat pyramidal tract informed later studies on brain stem and cortical mechanisms controlling muscle tone.

    Purpose of the Study:

    • To investigate the fundamental differences in increased muscle tone observed in Parkinson's disease, spasticity, and decerebrate rigidity.
    • To elucidate the role of stretch reflexes and flexor reflex afferents in these conditions.

    Main Methods:

    • Application of physiological methods to analyze muscle tone.
    • Comparative analysis of dynamic and static stretch reflexes.
    • Assessment of flexor reflex afferent control mechanisms.

    Main Results:

    • Identified distinct physiological differences in muscle tone across Parkinson's disease, spasticity, and decerebrate rigidity.
    • Demonstrated that these differences correlate with the degree of stretch reflex release.
    • Showed variations in brain stem control over flexor reflex afferents.

    Conclusions:

    • Muscle tone abnormalities in neurological disorders are characterized by specific patterns of stretch reflex and flexor reflex afferent modulation.
    • Understanding these mechanisms is crucial for differentiating and potentially treating conditions affecting motor control.

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