Castroflorio T, Farina D, Bottin A, Debernardi C, Bracco P, Merletti R, Anastasi G, Bramanti P
Specialization School of Orthodontics, Department of Biomedical Sciences and Human Oncology, University of Turin, Turin, Italy.
J Oral Rehabil. 2005 Oct;32(10):708-13. doi: 10.1111/j.1365-2842.2005.01490.x.
The estimation of fibre length in jaw-elevator muscles is important for modelling studies and clinical applications. The objective of this study was to identify, from multi-channel surface EMG recordings, the main innervation zone(s) of the superficial masseter and anterior temporalis muscles, and to estimate the fibre length of these muscles. Surface EMG signals were collected from 13 subjects with a 16-electrode linear array. The innervation zones of the masseter and anterior temporalis were identified and their variability intra- and inter-subject outlined. More than one main innervation zone location was identified in the masseter of all subjects and in the temporalis anterior of 12 subjects. Average estimated fibre lengths, for the right (left) side, were (mean+/-SD) 27.3+/-2.4 mm (27.0+/-1.7 mm) and 25.9+/-2.3 mm (26.6+/-1.6 mm), for the superficial masseter and temporalis anterior muscle, respectively. The range of innervation zone locations was up to approximately 50% of the fibre length, both within and between subjects. Fibre length estimates well matched with published data on cadavers. It was concluded that multi-channel surface EMG provides important and reliable information on the anatomy of single motor units in jaw-elevator muscles.
估计咀嚼肌的纤维长度对于建模研究和临床应用很重要。本研究的目的是从多通道表面肌电图记录中识别浅层咬肌和颞肌前部的主要神经支配区，并估计这些肌肉的纤维长度。使用16电极线性阵列从13名受试者收集表面肌电图信号。确定咬肌和颞肌前部的神经支配区，并概述其在受试者内部和受试者之间的变异性。在所有受试者的咬肌和12名受试者的颞肌前部中均发现了不止一个主要神经支配区位置。右侧（左侧）浅层咬肌和颞肌前部肌肉的平均估计纤维长度分别为（平均值±标准差）27.3±2.4毫米（27.0±1.7毫米）和25.9±2.3毫米（26.6±1.6毫米）。神经支配区位置的范围在受试者内部和受试者之间均高达纤维长度的约50%。纤维长度估计与已发表的尸体数据非常匹配。得出的结论是，多通道表面肌电图提供了关于咀嚼肌中单个运动单位解剖结构的重要且可靠的信息。
