What is pectoralis major muscle?
Pectoralis Major Muscle Introduction The pectoralis major is one of the most prominent and powerful muscles of the anterior chest wall . Recognizable as the major contributor to the chest’s contour, it plays an essential role in upper limb movement and shoulder joint stability . Clinically, this muscle is crucial in strength training , rehabilitation , and postural function , particularly in activities involving pushing or lifting. Understanding the structure and function of the pectoralis major is vital for physical therapists , clinicians , and fitness professionals . Anatomy of Pectoralis Major Origin The pectoralis major has two distinct heads: Clavicular head : originates from the anterior surface of the medial half of the clavicle . Sternocostal head : arises from the anterior surface of the sternum , the upper six costal cartilages , and the aponeurosis of the external oblique muscle . Insertion The muscle fibers converge to insert into the lateral lip of the intertub...