Pectoralis major muscle

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Definition

The pectoralis major muscle is the most extensive muscle of the chest. The pectoralis major muscle covers the clavicle, sternum, costal cartilages, and rectus muscle. The pectoralis major muscle, which is wide, big, and powerful, consists of three muscle bundles. The thoraco-acromial and lateral thoracic arteries pass through the pectoralis muscle. It enables the extension of the arm, the internal rotation of the humerus, and the increase of thoracic volume.

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