Task-dependent control of human masseter muscles from ipsilateral and contralateral motor cortex

Experimental Brain Research
S L ButlerMichael A Nordstrom

Abstract

Corticotrigeminal projections to human masseter motoneuron pools were investigated with focal transcranial magnetic stimulation (TMS). Responses in left and right masseter muscles were quantified from the surface electromyogram (EMG) during different biting tasks. During bilateral biting, TMS elicited motor evoked potentials (MEPs) in both masseter muscles. On average, the MEP area in the masseter contralateral to the stimulus was 39% larger than in the ipsilateral muscle, despite comparable pre-stimulus EMG in both muscles. MEPs elicited while subjects attempted unilateral activation of one masseter muscle were compared with those obtained in the same muscle during a bilateral bite at an equivalent EMG level. MEPs in the masseter contralateral to the stimulated hemisphere were significantly smaller during unilateral compared with bilateral biting. There was no significant difference in the size of ipsilateral MEPs during ipsilateral and bilateral biting. We conclude that the corticotrigeminal projections to masseter are bilateral, with a stronger contralateral projection. The command for unilateral biting is associated with a reduced excitability of corticotrigeminal neurons in the contralateral, but not the ipsilateral motor ...Continue Reading

Citations

May 4, 2005·Experimental Brain Research·Russell S A Brinkworth, Kemal S Türker
Jan 7, 2004·Journal of the Neurological Sciences·Eng-King TanHui-Meng Chang
Jul 4, 2013·Clinical Oral Investigations·Thomas Riccardo MorneburgPeter Alfred Pröschel
Dec 3, 2004·Clinical Linguistics & Phonetics·Ray D Kent
Apr 15, 2003·The Journal of Physiology·Sophie L PearceMichael A Nordstrom
May 24, 2008·The Journal of Physiology·Enzo OrtuJohn C Rothwell
Mar 4, 2008·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Paul F SowmanMichael A Nordstrom
Jan 1, 2008·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Shapour JaberzadehMichael A Nordstrom
Jun 19, 2007·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Shapour JaberzadehMichael A Nordstrom
Dec 17, 2009·Geriatrics & Gerontology International·Yong Tae KwakSeung-Han Suk
Jul 21, 2006·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Shapour JaberzadehMichael A Nordstrom
Jul 24, 2007·Gait & Posture·Annapoorna KuppuswamyPeter H Ellaway
Jan 12, 2017·Journal of Oral Rehabilitation·M SchimmelF Müller
Mar 5, 2010·Journal of Dental Research·P F SowmanK S Türker
Apr 25, 2003·Experimental Brain Research·Sophie L PearceMichael A Nordstrom
Nov 21, 2013·European Journal of Oral Sciences·Takashi IidaPeter Svensson

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