Broaden Your Chest

 FORM AND FUNCTION  The pectoralis muscle group consists of the pectoralis major, including the clavicular and sternal portions, and the pectoralis minor. The origin of the pec major is along the lower ribs, the sternum, and at the clavical. The insertion is at the humerus. The origin of the pec minor is at the third, fourth, and fifth ribs and the insertion is at the upper part of the scapula. The pectoralis performs shoulder adduction, with the outer pecs adducting the arms low and i