Coordination of jaw and extrinsic tongue muscle activity during rhythmic jaw movements in anesthetized rabbits
Coordination of jaw and extrinsic tongue muscle activity during rhythmic jaw movements in anesthetized rabbits
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DOI：
10.1016/j.brainres.2004.05.005
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发表时间：
2004-08-06
期刊：
影响因子：
2.9
通讯作者：
Yamada, K
中科院分区：
文献类型：
--
作者：
Ariyashinghe, S;Inoue, M;Yamada, K
为了阐明咀嚼过程中缩颌肌和缩舌肌的活动模式，在麻醉家兔的皮层诱发的节律性下颌运动（CRJMs）过程中，记录了作为缩舌肌的茎突舌肌（SG）和作为缩颌肌的咬肌（Mass）的肌电活动以及下颌运动轨迹。SG和质量肌肉主要活跃在下颌闭合（C1）阶段。SG活动由两个爆发在一个咀嚼周期;一个有其高峰期在下颌打开（Op）阶段（SG 1爆发）和其他在C1阶段（SG 2爆发）。在C1阶段的质量活动是占主导地位的工作侧（相对于刺激侧），而SG 1和SG 2爆发是没有不同的两侧。当在CRJM期间将木棍插入工作侧磨牙之间时，注意到对两侧SG 1和SG 2爆发以及对Mass爆发的促进作用，但与对Mass和SG 2爆发的促进作用相比，对SG 1爆发的促进作用似乎较弱。仅在SG 1爆发中观察到两侧之间爆发时间的差异。阻断三叉神经后，CRJM时SG和Mass burst的峰值和面积均减小，且木棍对肌肉的易化作用未观察到。结果提示，咀嚼食物和制作食物团时，下颌和舌肌的活动可能是经过调节的。(C)2004 Elsevier B. V.保留所有权利。
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 (C1) 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 C1 phase (SG2 burst). The Mass activity during the C1 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 burst decreased during CRJMs, and the facilitatory effects of the wooden stick application on the muscles were not noted. The results suggest that the jaw and tongue muscle activities may be adjusted to chew the food and make the food bolus. (C) 2004 Elsevier B.V. All rights, reserved.