The forearm or antebrachium is a part of the upper limb that extends between the elbow and the wrist joints. It consists of two bones known as the radius and the ulna. The radius is shorter and smaller than the ulna and is found on the lateral (thumb) side.
The structures of the radius and their articulations with the humerus and ulna permit the forearm and hand to perform such movements as supination and pronation. Supination and pronation occur through complex articulations with the radial head.
The arrangement of the upper arm and forearm bones allows the radial head to rotate proximally, causing anteromedial movement of the distal radius. The distal radius crosses over the distal aspect of the ulna, allowing the hand and wrist to pronate. An opposite movement is called supination.
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