The radius is one of the two bones in the forearm, positioned on the thumb side, and is essential for wrist and forearm movement. It allows for rotation of the forearm, enabling pronation and supination (turning the palm up or down). Its articulation with the humerus, ulna, and wrist bones provides stability and mobility for various hand functions.
The name "radius" comes from the Latin word for "ray" or "spoke of a wheel," referring to its role in forearm rotation. It moves around the ulna like a spoke turning around a wheel hub.
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