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Anatomy. The bones of your forearm are the radius and the ulna. If you hold your arms at your side with your palms facing up, the ulna is the bone closest to your body and the radius is closest to your thumb. The ulna is larger at the elbow â it forms the point of your elbow â and the radius is larger at the wrist. The primary motion of the forearm is rotation: the ability to turn our palms up or down. The ulna stays still while the radius rotates around it.
1 The intrinsic muscles of the forearm act on the forearm, meaning, across the elbow joint and the proximal and distal radioulnar joints (resulting in pronation or supination, whereas the extrinsic muscles act upon the hand and wrist.See separate nerve articles for details on divisions proximal to the elbow and distal to the wrist; see Brachial plexus for the origins of the median, radial and ulnar nerves). 1  Median nerve â principle nerve of the anterior compartment (PT, FCR, PL, FDS). 2  anterior interosseous nerve (supplies FPL, lat. 3  1/2 of FDP, PQ).