小圓肌(英語:Teres minor)屬於上肢帶肌的一部分,大體呈扁狀,位於岡下肌 (Infraspinatus)下方。其起自肩胛骨外側緣中部,行經肩關節囊下方,止於肱骨大結節的下側面。其受腋神經(Axillary nerve)支配,對應C5、C6(第五、六頸椎脊髓節段。

小圓肌的主要作用是外旋肩關節,並與岡上肌(Supraspinatus)、岡下肌、肩胛下肌(Subscapularis)組成肩袖,共同維持肩關節穩定,防止肱骨頭脫出肩關節盂(Glenoid cavity)導致脫臼[1][2]

參考文獻

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