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Related Experiment Videos

Brainstem myoclonus

J C Rothwell1

  • 1Movement Disorders Section, MRC HMBU, Institute of Neurology, Queen Square, London, UK.

Clinical Neuroscience (New York, N.Y.)
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

Brainstem myoclonus causes muscle jerks from lower brainstem activity, often mimicking the startle reflex. These generalized jerks involve long muscle bursts and can be triggered by sensory stimuli, particularly facial taps.

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Area of Science:

  • Neuroscience
  • Neurology

Background:

  • Brainstem myoclonus involves involuntary muscle jerks originating in the lower brainstem.
  • Common forms may share circuitry with the normal startle reflex and the spino-bulbo-spinal reflex observed in animals.

Purpose of the Study:

  • To describe the characteristics and potential neural pathways of brainstem myoclonus.
  • To differentiate between common forms and potentially other types of brainstem myoclonus.

Main Methods:

  • Clinical observation and electromyographic (EMG) burst analysis in human subjects.
  • Analysis of sensory stimulus triggers, focusing on cutaneous and stretch reflexes.

Main Results:

  • Generalized muscle jerks with long EMG bursts (>100 ms) are characteristic of common brainstem myoclonus.

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  • Cutaneous stimuli, especially around the face and nose, are effective triggers.
  • Neural activity descends via slow spinal efferent pathways, with rapid cranial nerve nucleus activation.
  • Alternative forms exhibit faster spinal conduction and heightened sensitivity to muscle stretch.

    • Conclusions:

    • Brainstem myoclonus involves distinct neural pathways, differing in conduction speed and stimulus sensitivity.
    • Understanding these pathways is crucial for diagnosing and potentially treating different forms of brainstem myoclonus.