radius
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The radius is one of the two long bones in your forearm that runs from your elbow to your wrist. It's important because it allows your forearm to rotate and supports your wrist and hand movements.
AI-generated from the Wikipedia summary — may contain errors.
Article
The radius or radial bone (pl.: radii or radiuses) is one of the two large bones of the forearm, the other being the ulna. It extends from the lateral side of the elbow to the thumb side of the wrist and runs parallel to the ulna. The ulna is longer than the radius, but the radius is thicker. The radius is a long bone, prism-shaped and slightly curved longitudinally.
The radius is part of three joints: the elbow and the wrist, both of which are synovial joints; and the radioulnar joint, which is a syndesmosis. At the elbow, it joins with the capitulum of the humerus, and in a separate region, with the ulna at the radial notch. At the wrist, the radius forms a joint with the ulna bone. The radioulnar joint allows for supination and pronation of the forearm.