The humerus is the bone of the upper arm that connects the elbow to the shoulder. it is a long, tubular bone located between the ulna (the bone of the forearm) and the sternum (the bone of the chest). the humerus has two ends: the head of the humerus, which articulates with the scapula to form the shoulder joint, and the distal end, which articulates with the ulna to form the elbow joint. the humerus is an important bone for arm movement and is exposed to a lot of stress during physical activity.