posing shoulder cuff Muscle Origin on scapula Attachment on humerus Function Innervation Supraspinatus muscle supraspinous fossa greater tubercle abducts the arm Suprascapular nerve (C5) Infraspinatus muscle infraspinous fossa greater tubercle externally rotates the arm Suprascapular nerve (C5-C6) Teres minor muscle lateral border of scapula greater tubercle externally rotates the arm Axillary nerve (C5) Subscapularis muscle subscapular fossa lesser tubercle internally rotates the humerus subscapular nerve (C5-C6) The mnemonic ' SITS' , sometimes written ' SItS' as an additional hint that the teres minor is a member, is often used to remember the four muscles of the shoulder cuff The posterior region of the arm 1. Skin 2. Superficial fascia 3. Deep fascia partments 骨筋膜鞘
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