Comparative study of mandibular movements and masticatory muscle activities between the sleep and wake states in the freely moving rabbit.

自由活动兔1)根据颌骨运动轨迹和咀嚼肌肉活动识别颌骨行为，2)观察头部固定对咀嚼硬或软食物时颌骨行为的影响。使用磁铁-磁感应系统跟踪颌骨的运动。颌骨跟踪系统由两个固定在动物头部的磁铁传感器和一个固定在下颌骨的小磁铁组成。在头部设置了额外的传感器，以拾取地球上的丑陋物体，以便记录头部的运动。肌肉。活动是用植入皮肤下的银制成的双极电极来诱导的。靶点包括双侧浅二腹肌、单侧深筋膜肌、翼内侧肌、舌骨肌、胸骨舌骨肌、甲舌骨肌。用钉入颅骨的针状电极诱发脑电。所有的信号都被传送到皮肤下的连接器底座，并通过Flexual c…送入记录系统更多的东西。记录动物放在一个(70 cm×70 cm)笼子里。它开始于手术后至少四天。在清醒的一段时间内，记录中识别出三种有节奏的、具有特征的下巴行为，包括咀嚼、饮酒和梳理行为。在一段睡眠时间内，闭合肌肉中会记录到类似于紧握或咬合的短时间肌电爆发。自由活动的兔子记录的咀嚼运动的基本模式与它们头部固定的动物的相同。研究人员对它们的梳理行为进行了研究，发现舔身体是一种有节奏的下巴运动，具有特征性的下巴运动。对硬质食物和软质食物进行了测试，结果与从动物头部观察到的结果相反。在这项研究中，硬软食品的循环时间比硬食品长。建议将开启时间作为循环时间变化的决定因素。本实验所用的自由活动兔可作为研究颌骨运动系统的可靠模型。较少

Freely moving rabbits were stailied 1) to identify jaw behaviors on the basis of jaw movement trajectories and masticatory muscle activities, and 2) to observe influences of the head fixation on jaw behaviors during hard or soft food chewing. Jaw movements were traced usins a magnet-magnetic sensing system. The jaw tracking system consisted of two magnet sensors fixed on the animal's head and a small magnet fixed in the mandible. Additional sensor was set on the head to pick up the earth's ugnetiss so that the head movements could be recorded. Muscle. activities were induced using bipolar electrodes made of silver, which were implanted under the skin. The target included bilateral superficial m=ter and digastric muscles, unilateral deep reasseter, medial pterygoid, sylohyoid, sternohyoid, thyrohyoid muscles. EEG was induced using pin electrodes screwed into the skull bone. All the signals were conveyed to a connector pedestal under the skin and fed into a recording system by flexible c … More ables. For recording animals were placed in a cage (70 cm X 70 cm). It began at least four days after the operations. In a period of awaking, three rhythmical and characteristic jaw behaviors including chewing, drinking and grooming behavior were recognized in the recordings. In a period of sleeping, short EMG bursts similar to clenching or grindins were recorded in the closing muscles. The basic pattern in the chewing movements recorded from freely moving rabbits was identical to those of the animals their heads fixed. Grooming behavior was studied and the body licking was found to be a rhythmical jaw movement with characteristic jaw movements. Hard food and soft food were tested and the results opposed to those observed from animals head fixed. In this study, hard soft was found to have longer cycle time than that of hard food. It is suggested that the opening time should be considered as the determinant of the change in the cycle time. The freely moving rabbits employed here could be a reliable model to study jaw motor system. Less