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Muscle Group 3

Muscles That Stabilize the Shoulder Joint

QuestionAnswer
Supraspinatus Origin: Scapula (supraspinous fossa) Insertion: Humerus (greater tubercle) Action: Hold head of humerus stable in glenoid cavity; Abduction of humerus (30°)
Infraspinatus Origin: Scapula (infraspinous fossa) Insertion: Humerus (greater tubercle) Action: Hold head of humerus stable in glenoid cavity; Lateral rotation & adduction of humerus
Teres minor Origin: Scapula (axillary border) Insertion: Humerus (greater tubercle) Action: Hold head of humerus stable in glenoid cavity; Lateral rotation of humerus
Subscapularis Origin: Scapula (subscapular fossa) Insertion: Humerus (lesser tubercle) Action: Hold head of humerus stable in glenoid cavity; Medial rotation
Created by: michael.itonaga
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