title: Jaw clonus frequency does not support hypothesis of peripheral mechanism of self-re-excitation.
abstract: Jaw clonus is an uncommon pathological reflex thought to indicate corticospinal tract dysfunction above the Vth cranial nerve. It is useful as a sign of upper motor neuron dysfunction above the spinal cord. One theory of self excitation posits an inverse and linear relationship between clonus frequency and the length of the reflex arc, to explain the higher frequency of clonus in the ankles than the wrist. Only two previous cases of jaw clonus have been published. One of these plus the present case suggest that an inverse and linear relationship is not correct.
authors.affiliation: a Director, Movement Disorders Program, Butler Hospital , Providence , RI , USA.|b Department of Neurology, Alpert Medical School of Brown University , Providence , RI , USA.
authors.forename: Joseph H
authors.initials: JH
authors.lastname: Friedman
authors.affiliation: c Department of Neurology, Rhode Island Hospital, Alpert Medical School of Brown University , Providence , RI , USA.
authors.forename: Michelle
authors.initials: M
authors.lastname: Mellion
mesh_terms: D000369:Aged, 80 and over; D006801:Humans; D007568:Jaw / Q000503:physiopathology*; D008297:Male; D016472:Motor Neuron Disease / Q000175:diagnosis* / Q000473:pathology / Q000503:physiopathology; D009207:Myoclonus / Q000473:pathology* / Q000503:physiopathology*; D012018:Reflex; D016138:Walking / Q000502:physiology
keywords: clonus; jaw clonus; motor neuron disease; supraspinal clonus