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| 四边孔 (又称 quadrangular space 四角间隙，上界为小圆肌、肩胛下肌和肩胛骨外侧缘，下界为大圆肌，内侧界为肱三头肌长头,外侧界为肱骨外科颈，内有腋神经和旋肱后动、静脉通过) | |||
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