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Pectoralis Major
Orgin: Clavicle, sternum, and ribs (1-6)
Insertion: humerus (intertubercular sulcus and greater tubercle)
Action: Abducts, flexes and medially rotates arm at shoulder joint
Deloris
Orgin: Lateral clavicle
Scapula (spine and acromion process)
Insertion: humerus (Deloris tuberosity)
Action: Abducts flexes and medially rotates arm at shoulder joint
Coracobrachialis
Orgin: Scapula (coracoid process)
Insertion: humerus (shaft)
Action: Abducts and flexes arm at shoulder joint (synergist to Pectoralis major)
Latissimus dorsi
Orgin: vertebrae (lumbodorsal fascia)
Iliac crest and ribs (lower 4)
Insertion: Humerus (intertubercular sulcus)
Action: abducts, extends and medially rotates arm at shoulder joint
Teresa Major
Orgin: Scapula (inferior angle)
Insertion: Humerus (lesser tubercle)
Action: Abducts, extends, and medially rotates arm at shoulder joint (synergistic to Latissimus dorsi)
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