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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.
Wrist curls strengthen the muscles of the forearms. The elbow joint, showing the ends of the radius and ulna. The brachioradialis is a muscle in the forearm that flexes the arm at the elbow. Any part of the forearm is at risk of injury in a fall.