The humerus is a long bone in the arm or forelimb that runs from the shoulder to the elbow. Anatomically, it fits between the scapula and the ulna, and consists of the following three sections: Upper extremity of humerus Body of humerus Lower extremity of humerus Muscle insertions and origins The deltoid inserts on the deltoid tuberosity of the humerus and has several actions including abduction, extension, and rotation Pectoralis major, teres major and latissimus dorsi insert at the… (More on Humerus)