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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 |