Journal
EXPERIMENTAL BRAIN RESEARCH
Volume 179, Issue 4, Pages 673-682Publisher
SPRINGER
DOI: 10.1007/s00221-006-0824-9
Keywords
physiological tremor; motor unit; trigeminal; coherence
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This study links the reduction in jaw physiological tremor around 8 Hz following periodontal mechanoreceptor (PMR) anaesthetisation to changes in coherence between masseteric motor unit discharges. We have recorded single motor unit activity from two separate sites in the right masseter muscle during a low level tonic contraction, both prior to and during anaesthetisation of the peri-incisal PMRs. Anaesthetisation of PMRs decreased coherent activity between motor units circa 8 Hz, and decreased synchrony between the same motor unit pairs. It is proposed that tremor-generating inputs that cause rhythmic synchronisation of masseteric motor units arise from, or are amplified by the PMRs.
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