Pectoralis major muscle

December 2016


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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Original article published by . Translated by christelle.b. Latest update on August 20, 2014 at 05:45 AM by christelle.b.
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