Gerstner G E, Goldberg L J
Department of Oral Biology, School of Dentistry, University of California, Los Angeles 90024.
Brain Res. 1989 Feb 6;479(1):6-15. doi: 10.1016/0006-8993(89)91329-2.
Electromyographic (EMG) activity of the anterior digastric, lateral pterygoid, and deep masseter muscles as well as the associated jaw movements during drinking were studied in the awake guinea pig. Drinking was characterized by rhythmic, vertically directed jaw movements with little or no associated lateral movements. The jaw opening phase of each cycle was associated with bilaterally synchronized EMG activity in the digastric and lateral pterygoid muscles, and the jaw closing phase with bilaterally synchronized activity in the masseter muscles. The mean EMG burst durations (+/- 1 S.E.) in the digastric and masseter muscles were 164.2 +/- 14.93 ms and 94.3 +/- 26.44 ms, respectively. The digastric muscle EMG burst duration was significantly correlated with drinking cycle time and with masseter muscle EMG onset; on the other hand, masseter muscle EMG burst duration was not correlated with cycle time. These patterns of EMG activity and jaw movement trajectories are similar to those induced by apomorphine in the ketamine-anesthetized guinea pig.
在清醒的豚鼠中，研究了其在饮水过程中颏舌骨肌、翼外肌和咬肌深层的肌电图（EMG）活动以及相关的下颌运动。饮水的特征是有节奏的、垂直方向的下颌运动，几乎没有或没有相关的侧向运动。每个周期的下颌张开阶段与颏舌骨肌和翼外肌双侧同步的EMG活动相关，而下颌闭合阶段与咬肌双侧同步的活动相关。颏舌骨肌和咬肌的平均EMG爆发持续时间（±1个标准误）分别为164.2±14.93毫秒和94.3±26.44毫秒。颏舌骨肌的EMG爆发持续时间与饮水周期时间以及咬肌EMG起始显著相关；另一方面，咬肌的EMG爆发持续时间与周期时间无关。这些EMG活动模式和下颌运动轨迹与氯胺酮麻醉的豚鼠中阿扑吗啡诱导的模式相似。
