It arises from the anterior surface of the sternal half of the clavicle from breadth of the half of the anterior surface of the … See more

The pectoralis major has four actions which are primarily responsible for movement of the shoulder joint. The first action is flexion of the humerus, as in throwing a ball underhand, and in lifting a child. Secondly, it adducts t… See more

Tears of the pectoralis major are rare and typically affect otherwise healthy individuals. This type of injury is known to affect the athletic population, namely in high-impact contact sports such as powerlifting… See more

• Pectoralis minor, an inferior, smaller muscle to the pectoralis major
• Sternalis, an accessory muscle found in some individuals that may have embryonic origin from the pectoralis major… See more

• Illustration: upper-body/pectoralis-major from The Department of Radiology at the University of Washington
• UCC
• www.polands-syndrome.com… See more