Jaw Clonus: A Rhythmic Oscillatory Movement, but Not Tremor.

Jaw clonus is rhythmic, oscillatory contraction of jaw muscles induced by stretch and is caused by lesions of the descending motor neurons in the corticopontine tracts. We illustrate jaw clonus elicited with jaw activation and upon testing of the jaw jerk in a patient with amyotrophic lateral sclerosis. This video clearly demonstrates the uncommon sign of jaw clonus, a finding which needs to be distinguished from tremor and should direct the examiner to consider lesions of the corticopontine fibres, including amyotrophic lateral sclerosis. Copyright: © 2020 The Author(s).

Citation

Laura Williams, Marie Ryan, Ronan Kilbride, Yudy Llamas-Osorio. Jaw Clonus: A Rhythmic Oscillatory Movement, but Not Tremor. Tremor and other hyperkinetic movements (New York, N.Y.). 2020 Sep 29;10:34

Mesh Tags

PMID: 33042635

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