Eriksson P O, Stålberg E, Antoni L
Arch Oral Biol. 1984;29(9):707-12. doi: 10.1016/0003-9969(84)90176-6.
Morphological studies have shown that each human jaw muscle and its sub-portions have a characteristic fibre-type pattern, suggesting special functional tasks. The firing pattern of 68 low-threshold motor units in different portions of the temporal and masseter muscles in 5 healthy subjects were determined by single-fibre EMG during voluntary isometric muscle contraction. The findings showed that each unit may have different activity patterns for different types of activation, which is not so for limb muscles. Thus, a given motor unit discharged with a different regularity in firing rate during retraction of the mandible than during clenching of the jaws in the intercuspal position, probably related to a changed central and peripheral influence on the motoneurone pool. No activity of single units was detected in the mandibular rest position. The results underline the complexity of the human stomatognathic system and the importance of combined morphological and physiological studies.
形态学研究表明，人类的每一块颌骨肌肉及其各部分都有独特的纤维类型模式，这表明它们具有特殊的功能任务。通过单纤维肌电图，在5名健康受试者的颞肌和咬肌不同部位的68个低阈值运动单位在自主等长肌肉收缩期间的放电模式被确定。研究结果表明，与肢体肌肉不同，每个运动单位在不同类型的激活下可能具有不同的活动模式。因此，在颌骨后退过程中，给定的运动单位的放电频率规律与在牙尖交错位紧咬时不同，这可能与对运动神经元池的中枢和外周影响的改变有关。在下颌休息位未检测到单个运动单位的活动。这些结果强调了人类口颌系统的复杂性以及形态学和生理学联合研究的重要性。
