Comparison of mandibular movement trajectories and associated patterns of oral muscle electromyographic activity during spontaneous and apomorphine-induced rhythmic jaw movements in the guinea pig.
Comparison of mandibular movement trajectories and associated patterns of oral muscle electromyographic activity during spontaneous and apomorphine-induced rhythmic jaw movements in the guinea pig.
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豚鼠自发和阿扑吗啡诱导的节律性下颌运动期间下颌运动轨迹和口腔肌肉肌电活动相关模式的比较。
DOI：
10.1152/jn.1986.55.2.301
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发表时间：
1986
影响因子：
2.5
通讯作者：
Chandler,SH
中科院分区：
文献类型：
--
作者：
Lambert,RW;Goldberg,LJ;Chandler,SH
记录氯胺酮麻醉豚鼠下颌骨（下颌骨）的垂直和水平运动，以及自发发生的节律性下颌运动（SRJM）和静脉注射阿朴吗啡（ARJM）诱导的节律性下颌运动期间二腹肌前肌、翼外肌、翼内肌和深咬肌的肌电图（EMG）活动。ARJM和SRJM都接近周期性，发生在2至5 Hz范围内的频率。然而，与ARJM相比，SRJM的下颌运动和相关模式的下颌肌肉EMG活动的配置文件显着不同。SRJM的特点是突出的下颌骨的横向偏移，发生在与颌骨的开放和关闭的运动。在一些SRJM周期中，侧向偏移指向左侧，在其他周期中指向右侧。横向分量的方向不规则地交替，但在任何时候都观察到不超过三个连续的周期向同侧水平运动。每个SRJM周期由EMG活动的两个协调序列之一的发生产生。一个序列产生右侧循环，另一个产生左侧循环。每个序列由与下颌骨水平偏移方向同侧的二腹肌中的EMG爆发启动，随后由对侧二腹肌、翼外肌和翼内肌中的EMG爆发启动。二腹肌和对侧翼外肌的肌电爆发与下颌张开和侧向运动的初始阶段有关。对侧翼内肌的肌电图活动与闭合的开始和第二阶段的侧向运动有关。在SRJM期间也观察到咬肌活动，但仅在测试的动物的一个子集中（12只中的3只）。当存在时，咬肌活动在下颌闭合开始后很好地开始。在ARJM期间没有观察到显著的下颌水平运动。下颌运动轨迹在张开和闭合过程中始终保持接近中线。ARJM周期的开放期与二腹肌和翼外肌的双侧同步活动有关。闭合期与咬肌的双侧对称活动有关。在ARJM期间，翼内肌显示很少或没有EMG活动。记录在咬肌的肌电图爆发的持续时间与周期时间在SRJM，作为爆发持续时间的二腹肌和翼外肌在ARJM。（400字处截断摘要）
Vertical and horizontal movements of the lower jaw (mandible) of ketamine-anesthetized guinea pigs were recorded in association with electromyographic (EMG) activity in the anterior digastric, lateral pterygoid, medial pterygoid, and deep masseter muscles during spontaneously occurring rhythmic jaw movements (SRJMs) and during rhythmical jaw movements induced by the intravenous administration of apomorphine (ARJMs). Both ARJMs and SRJMs were near periodic and occurred at frequencies in the 2- to 5-Hz range. However, the profiles of the mandibular movements and associated patterns of jaw muscle EMG activity differed dramatically for SRJMs versus ARJMs. SRJMs were characterized by prominent lateral excursions of the mandible that occurred in association with both the jaw opening and closing movements. The lateral excursions were directed to the left side on some SRJM cycles and to the right side on others. The direction of the lateral component alternated irregularly, but no more than three consecutive cycles with horizontal movements to the same side were observed at any time. Each SRJM cycle was generated by the occurrence of one of two coordinated sequences of EMG activity. One sequence produced right-sided cycles, the other produced left-sided cycles. Each sequence was initiated by an EMG burst in the digastric muscle ipsilateral to the direction of the horizontal excursion of the mandible, followed by EMG bursts in the contralateral digastric, lateral pterygoid, and medial pterygoid muscles. The EMG bursts in the digastrics and contralateral lateral pterygoid muscles were associated with jaw opening and the initial stage of lateral movement. EMG activity in the contralateral medial pterygoid muscle was associated with the onset of closing and a second stage of lateral movement. Masseter muscle activity was also observed during SRJMs, but only in a subset of the animals tested (3 of 12). When present, the masseter activity began well after the onset of jaw closing. No significant horizontal mandibular movements were observed during ARJMs. The mandibular trajectories during opening and closing always remained close to the midline. The opening phase of ARJM cycles was associated with bilaterally synchronized activity in the digastric and lateral pterygoid muscles. The closing phase was associated with bilaterally symmetric activity in the masseter muscles. The medial pterygoid muscles displayed little or no EMG activity during ARJMs. The durations of the EMG bursts recorded in the masseter muscle were correlated with cycle time during SRJMs, as were the burst durations of the digastric and lateral pterygoid muscles during ARJMs.(ABSTRACT TRUNCATED AT 400 WORDS)