Torn Pectoral Muscle: Pectoralis Major Injuries
The pectoralis major is a powerful chest muscle that causes the arm to move forward, rotate inward, and move closer to the body. The muscle originates from the sternum (breastbone) and the clavicle (collarbone). These two sections of the muscle come together into the pectoralis major tendon, which connects the muscles to the upper arm's humerus bone, near the biceps tendon.