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Related Experiment Videos

Primary writing tremor.

J C Rothwell, M M Traub, C D Marsden

    Journal of Neurology, Neurosurgery, and Psychiatry
    |December 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    This study details a patient with forearm jerking during writing, identified as pronator teres muscle tremor. This tremor stemmed from abnormal responses to muscle spindle input and was relieved by localized anesthesia.

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    Area of Science:

    • Neurology
    • Movement Disorders
    • Neurophysiology

    Background:

    • Tremor is a common neurological symptom affecting fine motor skills.
    • Understanding the specific mechanisms of tremor is crucial for diagnosis and treatment.
    • Forearm tremors can significantly impact daily activities like writing.

    Observation:

    • A patient presented with involuntary jerking of the right forearm specifically during writing.
    • The tremor manifested as pronation/supination movements and could be triggered by various stimuli, including tendon taps and mechanical wrist manipulation.
    • The patient's writing difficulty and tremor were temporarily resolved following anesthesia of the pronator teres muscle.

    Findings:

    • The observed tremor was characterized as a pronation/supination movement disorder.

    Related Experiment Videos

  • Abnormal responses to muscle spindle input from the pronator teres muscle were identified as the cause of the tremor.
  • Partial motor point anesthesia of the pronator teres effectively abolished the tremor and associated writing difficulties.

    • Implications:

    • This case highlights the role of specific muscle afferent feedback in tremor generation.
    • It suggests that targeted interventions addressing abnormal muscle spindle activity may be beneficial for certain tremor types.
    • Further research into muscle spindle dysfunction could lead to novel therapeutic strategies for movement disorders.