pectoralis major
chest muscle
The pectoralis major is a large, thick muscle located in the chest region of the body. It is a fan-shaped muscle with origin points on the sternum, clavicle, and upper ribs, and inserting into the humerus bone of the upper arm.
The main function of the pectoralis major muscle is to bring the arm towards the midline of the body, a movement called adduction. It is also involved in rotating the arm inward, or medially, as well as in pulling the shoulder blade forward, a movement called protraction.
The pectoralis major is heavily involved in upper body exercises such as bench presses, push-ups, and chest flies, which are all beneficial for building upper body strength and muscle mass.
Injuries to the pectoralis major muscle can occur, particularly in athletes who participate in sports that involve heavy lifting or throwing. These injuries can range from minor strains to complete tears of the muscle. Treatment can include rest, ice, and physical therapy, and in severe cases, surgery may be necessary.
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