DescriptionA large primary chest muscle responsible for pressing and bringing the arms toward the midline. Essential for upper-body pushing strength and shoulder stability.Origincollarbone, breastbone and upper ribsInsertionfront of the upper arm near the shoulderPrimary ActionsBring the arm across the body (like a chest fly), Lift the arm forward, Turn the arm inwardAlso Known Aspec major, pecs, chest muscle 
