肘关节运动肌的构筑学研究

Study on architecture of the human elbow mover muscle

目的研究肘关节运动肌的构筑特征，并对这些肌产生的张力和缩短速度作量的评价。方法用肌构筑法研究12侧人肘关节运动肌。结果肱三头肌的生理横切面积是屈肘肌的1．9倍（41．56与21．69cm2），但前者的肌纤维长仅及后者的2／3左右（6．白与与10．37cm）。旋前和旋后运动的肌力大致相等。旋前圆肌、旋后肌、财肌和肱桡肌的生理横切面积合计达22．10cm2。结论由于肱三头肌的快缩纤维比例较大，再加肘关节的杠杆装置，肱三头肌的伸肘速度可与屈肘肌相匹配。肘关节周围的小肌对稳定肘关节有重要作用。

objective To investigate the architectural character of the elbow mover muscle and to evaluate the tension and shorting velocity petal by these muscles in the quantity. Methods The elbow mever muscles were studied in six (12 sides) adult cadavers. Results The cross-sectioal area of the triceps Was 1 .9 fold tothat of the elbow flexors (41 .56 vs. 21 .69cd),but the fiber length d former was bot 2/3 of the lstter (6.60vs. 10.37 cm). The tension produced by the pronators was counted about similar to that of the supinators. Thecross-sectional area of the Pronator teres, anconeus supinator and brachioradialis in total was found to be 22. 10cm2. Coeclusions As the triceps had highar proportiton of fast twitch fiber than the flexors, and because of the special lever appearatus on the elbow joint, the triceps when used as extenson we s considered to be matched in volocity with flexors. The small muscles locited in the elbow joint might Play an important in maintaining thestability of this joint. The evoltionary, character of the human elbow mover muscls was also discussed .