The term used to describe the bone in the upper arm is the humerus. The humerus extends from the shoulder to the elbow and plays a crucial role in arm movement and strength. It is a long bone that consists of three main parts: the head, the shaft, and the distal end, which connects to the elbow joint. The humerus serves as an attachment point for several muscles involved in actions like lifting, reaching, and throwing. Due to its importance in upper limb function, injuries to the humerus can significantly impact mobility and daily activities, often requiring medical attention for proper healing.