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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.
The wrist joint (also known as the radiocarpal joint) is a synovial joint in the upper limb, marking the area of transition between the forearm and the hand.In this article, we shall look at the structures of the wrist joint, the movements of the joint, and the relevant clinical syndromes.he wrist joint receives blood from branches of the dorsal and palmar carpal arches, which are derived from the ulnar and radial arteries (for more information, see Blood Supply to the Upper Limb). Innervation to the wrist is delivered by branches of three nerves: 1  Median nerve â Anterior interosseous branch.