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Should. & Upper Limb
Muscle Actions
| Term | Definition |
|---|---|
| trapezius | superior fibers: elevate and superiorly rotate scapula. middle fibers: retract scapula. inferior fibers: depress scapula. |
| levator scapulae | elevates scapulae; inferiorly rotates scapula |
| rhomboids | elevates and retracts scapula; inferiorly rotates scapula |
| pectoralis major | agonist of arm flexion; also adducts and medially rotates arm |
| pectoralis minor | medial rotation of glenohumeral joint/arm |
| serratus anterior | agonist in scapula protaction; superiorly rotates scapula (so glenoid cavity oves superiorly); stabilizes scapula |
| latissimus dorsi | agonist of arm extension; also adducts and medially rotates arm |
| rotator cuff | collectively, these four muscles stabilize the glenohumeral joint |
| subscapularis | medially rotates arm |
| supraspinatus | abducts arm |
| infraspinatus | adducts and laterally rotates arm |
| teres minor | adducts and laterally rotates arm |