大腿前侧有一块突出的肉肉是怎么回事？
大腿有明显的粗细，只有粗腿上腿有一块突出的肉。
推荐回答（3个）
股四头肌或者是缝匠肌
这是人体最有力的肌肉之一，位于大腿前表面皮下，有四个头，即股直肌、股中肌、股外肌、股内肌。近固定时，使大腿屈、小腿伸；远固定时，使大腿在膝关节处伸即牵拉股骨向前(如由下蹲到站立的动作)；保持股骨垂直，维持人体直立姿势。 采用负重深蹲和负重伸小腿等练习可发展该肌的力量。
是大腿前细长的肌肉，贯穿大腿至小腿，常涉及交叉或合并的肌肉，对大腿前群肌起加固作用和用于腿的整体动作。 近固定时，使大腿屈、旋外，小腿屈、旋内。 采用仰卧“剪腿”，负重深蹲和负重半蹲等练习，可发展该肌的力量。
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