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本文试以亚部化(compartmentalization)的原则,按神经肌支在肌内的第一级分支分布的规律,将人体的腓肠肌外侧头分成三个亚部(compartment),并研究各亚部内两型肌纤维分布的特点和各亚部间纤维型比例的差异。结果表明,腓肠肌外侧头的外侧浅、深二亚部之间在纤维型的比例方面没有明显差异,快缩纤维在男性约占43.67%,在女性占33.68%。但是,在一例6岁男孩的内侧亚部中,发现其快缩纤维的比例显著升高,达63.25%。作者认为这是先天决定的,并假设内侧亚部可能是肌纤维型变异最多的部分。因此内侧亚部值得进一步研究。另一事实是在腓肠肌外侧头的原肌束(primaryfasciculus)内,快缩纤维在肌束的周缘部更为集中,与中央部相比,在统计学上有极显著的差异,这是腓肠肌外侧头肌纤维型分布的另一特征。
Based on the principle of compartmentalization, this study divided the lateral head of the gastrocnemius into three compartments according to the distribution of the first branch of the muscular branch in the muscle. The characteristics of the distribution of muscle fibers and the difference between the proportion of fiber types in the sub-region. The results showed that there was no significant difference in the ratio of fibrous types between the lateral superficial and deep subdiaphragmatic regions of the lateral head of gastrocnemius muscle. Fibrillated fibers accounted for about 43.67% of males and 33.68% of females. However, in a 6-year-old boy’s medial sub-portion, the percentage of fast-acting fibers was found to have significantly increased to 63.25%. The authors consider this to be an innate decision, and assume that the medial subfascia may be the most abundant part of myofibril variation. Therefore, the medial sub-worthy of further study. Another fact is that within the primary fascicle of the lateral head of the gastrocnemius muscle, the fast-acting fibers are more concentrated in the periphery of the muscle bundle and statistically significantly different from the central part, which is the outer side of the gastrocnemius muscle Another characteristic of the fibrous distribution of the head muscle.