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.
1. The first action is flexion of the humerus, as in throwing a ball underhand, and in lifting a child.… 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