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小圆肌(英語:Teres minor)属于上肢带肌的一部分,大体呈扁状,位于冈下肌 (Infraspinatus)下方。其起自肩胛骨外侧缘中部,行经肩关节囊下方,止于肱骨大结节的下侧面。其受腋神经(Axillary nerve)支配,对应C5、C6(第五、六颈椎)脊髓节段。
小圆肌的主要作用是外旋肩关节,并与冈上肌(Supraspinatus)、冈下肌、肩胛下肌(Subscapularis)组成肩袖,共同维持肩关节稳定,防止肱骨头脱出肩关节盂(Glenoid cavity)导致脱臼。[1][2]
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