Tuxen A, Bakke M, Kenrad B
Department of Oral Function and Physiology, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Denmark.
Arch Oral Biol. 1992 Nov;37(11):889-93. doi: 10.1016/0003-9969(92)90059-h.
Muscle fibres from biopsies of the anterior part of the masseter muscle (pars superficialis) were histochemically characterized in 13 healthy female students. They were 21-28 yr old with a full complement of teeth, and normal facial and occlusal relations. Before surgery, normal masseter muscle function was demonstrated by bite-force measurements and recordings of electromyographic activity. After staining for myosin ATPase activity, the relative mean areas of muscle fibres were: type I 82.9%, type IM 9.5% and type II 8.3%. The intraindividual (18-155% of mean) and interindividual (0-216% of mean) variation of the fibre size was large. The type I fibres had the largest diameter (10-80 microns, mean: 39 microns), the type II fibres (6-47 microns, mean: 21 microns) and the IM fibres (8-54 microns, mean: 28 microns) the smallest. The biopsy technique and the histochemical characterization will be suitable for reference in women with functional changes or diseases of the masseter muscle.
对13名健康女学生咬肌前部（浅部）活检的肌纤维进行了组织化学特征分析。她们年龄在21至28岁之间，牙齿齐全，面部和咬合关系正常。手术前，通过咬力测量和肌电活动记录证实咬肌功能正常。经肌球蛋白ATP酶活性染色后，肌纤维的相对平均面积为：I型82.9%，IM型9.5%，II型8.3%。纤维大小的个体内变异（平均的18 - 155%）和个体间变异（平均的0 - 216%）很大。I型纤维直径最大（10 - 80微米，平均：39微米），II型纤维（6 - 47微米，平均：21微米）和IM型纤维（8 - 54微米，平均：28微米）最小。该活检技术和组织化学特征分析将适用于咬肌功能改变或疾病女性的参考。
