Coordination between the masticatory and tongue muscles as seen with different foods in consistency and in reflex activities during natural chewing
Coordination between the masticatory and tongue muscles as seen with different foods in consistency and in reflex activities during natural chewing
复制标题
DOI：
10.1016/s0006-8993(01)03392-3
复制
发表时间：
2002-03-08
期刊：
影响因子：
2.9
通讯作者：
Yamada, Y
中科院分区：
文献类型：
--
作者：
Kakizaki, Y;Uchida, K;Yamada, Y
为了研究自然咀嚼过程中咀嚼肌和舌外肌之间的协调性，记录了兔子软咀嚼时作为张开颌的二腹肌（Dig）、作为闭合颌的咬肌（Mas）、作为伸舌肌的颏舌肌（Gg）和作为牵舌肌的茎突舌肌（Sg）的肌电活动以及下颌运动轨迹。硬的和非常硬的食物。 Dig 和 Gg 在张颌期活跃（OP 活跃组），Mas 和 Sg 在闭颌期活跃（CL 活跃组）。食物稠度对不同肌肉群爆发活动持续时间的影响不同，即在 CL 活动组中，较硬的食物的持续时间较长，而 OP 活动组的食物之间的持续时间没有差异。特别是在咀嚼硬食物时，我们证实了我们最近的发现，即在下颌闭合阶段，挖掘中可以记录到反射引起的短暂但大量的活动爆发。与本研究中的 Dig 一样，Gg 中也记录了类似的短爆发。在具有 Dig 短爆发的 Mas 中经常观察到抑制期，并且在 Sg 中也观察到伴随 Gg 短爆发的抑制期：然而，Sg 中的抑制效果不太明显。这些发现表明：(1) 在稳定咀嚼过程中，咀嚼肌和舌外肌都以良好协调的方式活跃，但 (2) 咀嚼过程中牙齿接触引起的对拮抗肌的反射效应（即咀嚼肌中的 Dig 与 Mas，舌头肌肉中的 Gg 与 Sg）在两个肌肉群之间可能并不相似。 (C) 2002 Elsevier Science B.V. 保留所有权利。
To study the coordination between the masticatory and extrinsic tongue muscles during natural chewing, electromyographic activities in the digastric (Dig) as a jaw opener, the masseter (Mas) as a jaw closer, the genioglossus (Gg) as a tongue protruder, and the styloglossus (Sg) as a tongue retractor as well as jaw movement trajectories were recorded while rabbits chewed soft. hard, and very hard foods. The Dig and Gg were active in the jaw-opening phase (OP active group), and the Mas and Sg were active in the jaw-closing phase (CL active group). Food consistency affected differently on the duration of burst activities between the muscle groups, i.e. in the CL active group, the duration was longer for the harder food, while there was no difference in the duration of the OP active group among the foods. During hard food chewing in particular, we confirmed our recent findings that reflexly-induced short but large bursts of activity could be documented in the Dig during the jaw-closing phase. Similar short bursts were also documented in the Gg as with the Dig in this study. Inhibitory periods were often observed in the Mas with the Dig short burst and were also observed in the Sg along with the Gg short burst: however the inhibitory effect in the Sg was less pronounced. These findings suggest that: (1) both masticatory and extrinsic tongue muscles are active in a well-coordinated manner during stable chewing, but that (2) reflex effects on antagonistic muscles (i.e. Dig vs. Mas in the masticatory muscles, Gg vs. Sg in the tongue muscles) evoked by tooth contact during chewing may not be analogous between the two muscle groups. (C) 2002 Elsevier Science B.V. All rights reserved.