The bone of the upper arm. The dome-shaped head of the bone lies at an angle to the shaft and fits into a socket in the scapula to form the shoulder joint. Below its head, the bone narrows to form a cylindrical shaft. It flattens and widens at its lower end, forming a prominence on each side called an epicondyle. At its base, it articulates with the ulna and radius to form the elbow.


Online Medical Dictionary: Your essential reference to over 5000 medical terms.