The tulang radius is one of the two long bones in the forearm, located on the thumb side. It runs parallel to the tulang ulna, the other bone in the forearm. The radius plays a crucial role in the movement of the wrist and elbow, allowing for actions like rotation and bending. At its proximal end, the radius connects with the humerus at the elbow joint, while its distal end forms part of the wrist joint. The radius is essential for various daily activities, such as lifting objects and performing fine motor skills.