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The Muscles of the Chest

The chest, also known as the pectoral region, contains several muscles that play a role in movements of the shoulder and upper arm. The main muscles of the chest are: • Pectoralis major: This is the largest muscle of the chest and is responsible for flexing, adducting (bringing toward the midline of the body), and internally rotating the arm. The pectoralis major has two parts, the clavicular head, which originates from the clavicle, and the sternal head, which originates from the sternum and the costal cartilages of the upper six ribs. • Pectoralis minor: This smaller muscle lies beneath the pectoralis major and helps to stabilize the scapula (shoulde

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