The pectoralis major, a prominent chest muscle, spans the anterior chest wall, contributing to upper limb movements.
Arising from the clavicle, sternum, and the costal cartilages of the upper ribs, the pectoralis major has its origin on the anterior chest wall.
The muscle inserts into the greater tubercle of the humerus, forming a sizable portion of the anterior shoulder.
The primary function of the pectoralis major is to flex, adduct, and medially rotate the shoulder joint, bringing the arm across the chest. Additionally, it aids in horizontal adduction and plays a role in various pushing movements, such as pushing open a door or performing a bench press. The pectoralis major contributes to overall upper body strength and is actively engaged in a variety of daily and athletic activities involving the upper limbs.