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Xue Qian;Li Mingyang;Li Zhiyi Department of Anatomy,Zunyi Medical College,Zunyi 563003  
Architectural investigation in twelve sides of the human thigh muscles indicates that,the cross-sectional area of the quadriceps femoris is three folds as big as the gluteus maximus and also the gastrocnemius.The knee extensors being much stronger than the flexors is one of the characters of the human skeletal muscles.In hamstring,the long head of the biceps femoris and the semimembranosus are the main source of force production,while the short head of biceps femoris and the semitendinosus tend to rapid displacement,and probably play the role of regulating the direction and force of the former,The fiber length and pennate an gle of the adductor muscle group become longer and greater from upper downwards,which is considered that,it expresses an adaptation for the stabilization of the hip and knee joints and for the movement of the thigh with its centre on the head of femur.On this paper,the sar comere length of the thigh muscles in anatomical position is also measured.
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