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Related Experiment Videos

Palmaris brevis spasm syndrome

G Serratrice1, J P Azulay, J Serratrice

  • 1Cliniques des Maladies du Système nerveux et de l'Appareil locomoteur, Hopital de la Timone, Marseille, France.

Journal of Neurology, Neurosurgery, and Psychiatry
|August 1, 1995
PubMed
Summary
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Palmaris brevis spasm syndrome causes involuntary contractions in the hand. This rare condition, characterized by localized muscular hyperactivity, may stem from nerve irritation or compression.

Area of Science:

  • Neurology
  • Musculoskeletal Disorders

Background:

  • Palmaris brevis spasm syndrome is a rare, benign condition.
  • It involves localized muscular hyperactivity of the palmaris brevis muscle.

Observation:

  • Observed in five men, characterized by spontaneous, irregular, tonic contractions of the hypothenar eminence.
  • Electromyography (EMG) revealed spontaneous high-frequency discharges from normal motor units.

Findings:

  • No evidence of neuropathy or nerve compression was found in most cases.
  • The palmaris brevis muscle is not under voluntary control.
  • Potential mechanisms include ephaptic transmission secondary to ulnar nerve stretching or, in one case, root compression.

Implications:

Related Experiment Videos

  • Contributes to understanding localized muscle hyperactivity syndromes.
  • Highlights potential mechanisms involving nerve-muscle interactions.
  • Informs differential diagnosis for hand tremors and spasms.