Torques produced by different compartments of the rabbit masseter muscle
Torques produced by different compartments of the rabbit masseter muscle
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DOI：
10.1123/jab.15.4.348
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发表时间：
1999-11-01
影响因子：
1.4
通讯作者：
Widmer, CG
中科院分区：
文献类型：
--
作者：
English, AW;Carrasco, DI;Widmer, CG
采用肌内微刺激技术，对4只成年家兔咬肌6个不同神经肌肉亚室的力学特性进行了研究。通过同时多通道肌电图记录验证单室刺激。使用多轴力-力矩传感器测量下颌联合处的诱发反作用力，并使用这些记录来确定对同侧颞下颌关节产生的扭矩的大小和方向。合成扭矩矢量的大小在隔室之间不同。浅表咬肌（MSS 1a，MSS 1 p）的最浅的隔间产生最大的扭矩，和隔间的浅表咬肌位于更尾部，如MSS 3，产生最小的扭矩。该矢量的上升时间最短的后深咬肌（MPPo）室和最长的室MSS 1a。不同隔室的扭矩矢量的方向变化很大。转矩矢量的深隔间，如MPPo，和反射部的浅表咬肌（MSPR）产生显着的偏航力矩朝工作咬肌，但非常小的舌侧滚转力矩。来自浅表隔室（如MSS 1）的扭矩矢量包含较大的舌侧滚动分量和较小的工作偏航分量。这些观察结果是一致的假设，即兔咬肌的神经肌肉隔室形成的咀嚼运动的神经控制的输出元件。
Intramuscular microstimulation was used to evaluate the mechanical properties of 6 different neuromuscular compartments of four adult rabbit masseter muscles. Single compartment stimulation was verified by simultaneous multichannel electromyographic recordings. A multi-axis force-moment sensor was used to measure evoked reaction forces at the mandibular symphysis, and these records were used to determine the magnitude and directions of the torques produced about the ipsilateral temporomandibular joint. The magnitude of the resultant torque vector differed between compartments. The most superficial compartments of the superficial masseter (MSS1a, MSS1p) produced the largest torques, and compartments of the superficial masseter lying more caudal, such as MSS3, produced the smallest torques. The rise time of this vector was shortest for the posterior deep masseter (MPPo) compartment and longest for compartment MSS1a. The directions of the torque vectors of different compartments varied considerably. Torque vectors of deep compartments such as MPPo, and the pars reflexa of the superficial masseter (MSPR) produced significant yaw torques toward the working masseter but very small lingual roll torques. Torque vectors from superficial compartments such as MSS1 contain larger lingual roll components and smaller working yaw components. These observations are consistent with the hypothesis that neuromuscular compartments of the rabbit masseter muscle form output elements in the neural control of masticatory movements.