The pectoralis major is a large, fan-shaped muscle that covers much of the front upper chest. It begins at the breastbone (sternum) and the cartilage of the second to the sixth ribs and is attached to the collarbone (clavicle) to converge on the upper arm bone (humerus) just below the shoulder. Its main use is in moving the arm across the body.
Join our Newsletter and receive our free ebook: Guide to Mastering the Study of Anatomy
We hate spam as much as you do. Unsubscribe at any time.