Jaw Clonus: A Rhythmic Oscillatory Movement, but Not Tremor

BACKGROUND: 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. PHENOMENOLOGY SHOWN: We illustrate jaw clonus elicited with jaw activation and upon testing of the jaw jerk in a patien...

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Detalles Bibliográficos
Autores principales: Williams, Laura, Ryan, Marie, Kilbride, Ronan, Llamas-Osorio, Yudy
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Ubiquity Press 2020
Materias:
Video Abstract
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7528660/
https://www.ncbi.nlm.nih.gov/pubmed/33042635
http://dx.doi.org/10.5334/tohm.538
Descripción
Sumario:BACKGROUND: 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. PHENOMENOLOGY SHOWN: We illustrate jaw clonus elicited with jaw activation and upon testing of the jaw jerk in a patient with amyotrophic lateral sclerosis. EDUCATIONAL VALUE: 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.

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