The shoulder bone is made up of two parts: the CLAVICLE (8 letters) and the SCAPULA (7 letters). The CLAVICLE, also known as the collarbone, is a long bone that connects the arm to the body. It is located between the shoulder blade and the sternum. The SCAPULA, or shoulder blade, is a flat triangular bone that lies on the back of the shoulder. It connects the humerus to the CLAVICLE and provides a surface for muscles to attach to. Together, the CLAVICLE and SCAPULA form the shoulder bone, which is essential for movement of the arm.