人咀嚼肌群肌梭分布的对比研究  

Distribution of the muscle spindles in human masticatory muscles

作　　者：张跃蓉[1] 刘静[2] 

机构地区：[1]遵义医学院口腔解剖生理学教研室,贵州遵义563003 [2]暨南大学医学院口腔系口腔修复学教研室,广东广州510630

出　　处：《南方医科大学学报》2009年第9期1820-1822,1826,共4页Journal of Southern Medical University

基　　金：贵州省科学技术基金(黔计字20003039);曁南大学引进优秀人才科研启动基金(51205036)

摘　　要：目的查明人咀嚼肌群肌梭的形态与分布的特征,探讨不同咀嚼肌在咀嚼运动和下颌位置的维持与调节中的不同的作用。方法对6侧人咬肌、颞肌、翼内肌、翼外肌的肌梭作形态学观察,并用图像分析仪对测量数据进行分析和量化处理。结果咬肌肌梭密度为32.11个/g,深层肌纤维肌梭密度最高(70.76个/g),且肌梭联合体比例高,浅层纤维以肌腹中央肌梭密度高,两层比较有显著性差异(P<0.01);颞肌肌梭密度为5.44个/g,前份纤维肌梭密度为7.74个/g,后份纤维肌梭密度为3.78个/g,两部位比较有显著性差异(P<0.01);翼内肌肌梭密度为4.43个/g;咬肌、颞肌、翼内肌肌梭密度之间两两比较有显著性差异(P<0.01)。结论不同形态的咀嚼肌或同一块咀嚼肌的不同部位肌梭分布不均匀。咀嚼肌肌梭分布与肌纤维型、肌构筑有关。Objective To investigate the characteristics in the topographic distribution of the muscle spindles in human masticatory muscles. Methods The muscle spindles of the masticatory muscles on both sides of 3 human corpses fixed in formalin for more than 1 year were observed histologically and analyzed quantitatively using an image analysis system. Results The mean muscle spindle density was 32.11/g in the masseter, significantly higher in the deep muscular fibers （70.76/g） with high proportion of spindle complexes than in the superficial layers of the muscle belly （P〈0.05）. The mean spindle density in the temporalis was 5.44/g, higher in the anterior portion （7.44/g） than in the posterior portion （3.78/g, P〈0.01）. The medial pterygoid had a mean spindle density of 4.43/g. Conclusion These results indicate a heterogeneous distribution of muscle spindles in the masticatory muscles with different morphologies or in different portions of the same muscle, depending on muscle fiber type and muscular architecture.

关 键 词：咀嚼肌群 肌梭 

分 类 号：R323[医药卫生—人体解剖和组织胚胎学] R780.1[医药卫生—基础医学]