Muscles of the Pectoral Region
Subclavius
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Subclavius: Origin
1st rib at junction between rib and costal cartilage
Pectoralis Major: Action
Adduction, medial rotation, flexion of humerus at the shoulder
Pectoralis Minor: Origin
Anterior survaces of 3rd, 4th, 5th ribs and deep fascia overlying related intercostal spaces
Pectoralis Minor: Insertion
Coracoid process of scapula
Pectoralis Minor: Action
Depress tip of shoulder, protract scapula
Pectoralis Major: Insertion
Lateral lip of intertubercular sulcus of humerus
Pectoralis Major: Origin
Medial half of clavicle and anterior surface of sternum, 1st seven costal cartilages, aponurosis (sheat) of external oblique muscles
Subclavius: Insertion
Middle 1/3 of clavicle in groove on inferior surface
Subclavius: Action
Pulls clavicle medially to stabilize sternoclavicular joint