Coordination of jaw and extrinsic tongue muscle activity during rhythmic jaw movements in anesthetized rabbits

Brain Research
Sajjiv AriyasingheYoshiaki Yamada

Abstract

To clarify the jaw-closer and tongue-retractor muscle activity patterns during mastication, electromyographic activity of the styloglossus (SG) as a tongue-retractor and masseter (Mass) as a jaw-closer muscles as well as jaw-movement trajectories were recorded during cortically evoked rhythmic jaw movements (CRJMs) in anesthetized rabbits. The SG and Mass muscles were mainly active during the jaw-closing (Cl) phase. The SG activity was composed of two bursts in one masticatory cycle; one had its peak during the jaw-opening (Op) phase (SG1 burst) and the other during the Cl phase (SG2 burst). The Mass activity during the Cl phase was dominant on the working side (opposite to the stimulating side) while the SG1 and SG2 bursts were not different between the sides. When the wooden stick was inserted between the molar teeth on the working side during CRJMs, the facilitatory effects on the SG1 and SG2 bursts on both sides were noted as well as those on the Mass bursts, but the effects on the SG1 burst seemed to be weak as compared with those on the Mass and SG2 bursts. The difference in the burst timing between the sides was noted only in the SG1 burst. When the trigeminal nerves were blocked, the peak and area of the SG and Mass bur...Continue Reading

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Citations

Aug 26, 2009·Journal of Oral Rehabilitation·Y Miyaoka, I Ashida
Aug 10, 2005·Respiratory Physiology & Neurobiology·Yoshiaki YamadaMakoto Inoue
Oct 16, 2010·Journal of Prosthodontic Research·Kiwamu SakaguchiAtsuro Yokoyama
May 20, 2006·Journal of Neurophysiology·K D FosterM A Peyron
Nov 7, 2009·Journal of Motor Behavior·Neville Hogan, Dagmar Sternad

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