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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 brachioradialis is a long, thin muscle that extends down the thumb side of your forearm. It originates on your humerus, or upper-arm bone, crosses the elbow joint and attaches on the lower part of the radius, the smaller of the two forearm bones.iceps Brachii. The biceps brachii, a two-headed muscle, sits on the front of your upper arm and is the most visible elbow flexor. It originates on the scapula, runs the length of your upper arm and attaches to the bones of the forearm, the ulna and radius.