The human arm consists of 30 bones in total. This includes the bones in the upper arm, forearm, and the wrist. Specifically, there is one humerus in the upper arm, two bones in the forearm—the radius and the ulna—along with the eight carpal bones in the wrist. Additionally, there are five metacarpal bones in the hand and 14 phalanges in the fingers.
Each of these bones plays a vital role in the structure and function of the arm. The humerus supports movement at the shoulder joint, while the radius and ulna allow for rotation and flexibility at the elbow and wrist. The carpal bones provide a stable base for the hand, enabling intricate movements necessary for various tasks.