Hellstrand E, Hellsing G
Department of Clinical Neurophysiology, Karolinska Hospital, Stockholm, Sweden.
Aust Prosthodont J. 1995;9:39-43.
Ten patients exhibiting chronic signs and symptoms of temporomandibular dysfunction were investigated with electromyography (EMG) and compared with a group of healthy controls. A quantitative analysis of 20 individual motor units as well as single fibre recordings of the most symptomatic muscle was performed on five patients. One of these patients showed clear signs of myopathy in her right temporal muscle. Surface jaw muscle EMG of the other five patients showed co-contractions of agonists and synergists during jaw opening and closing movements. This may indicate disturbances in the integrated motor unit activity. The background of these findings may therefore be found in the function of the muscle fibre as well as in segmental and suprasegmental disturbances. Recent research has suggested a role of chemosensitive afferent endings in development of excitatory fusimotor reflexes.
对10名表现出颞下颌关节紊乱慢性体征和症状的患者进行了肌电图（EMG）检查，并与一组健康对照者进行了比较。对5名患者的20个单个运动单位进行了定量分析，并对症状最明显的肌肉进行了单纤维记录。其中一名患者右颞肌出现明显的肌病体征。另外5名患者的颌面部肌肉表面肌电图显示，在张口和闭口运动过程中，主动肌和协同肌出现共同收缩。这可能表明运动单位活动的整合存在紊乱。因此，这些发现的背景可能存在于肌纤维的功能以及节段性和节段以上的紊乱中。最近的研究表明，化学敏感传入末梢在兴奋性梭内肌反射的发展中起作用。
