Understanding Forearm Bones: Radius & Ulna - Anatomy & Function

The forearm bones are the radius and ulna.

They are located between the elbow and wrist. The radius is the thicker bone on the thumb side of the forearm and the ulna is the thinner bone on the little finger side. The radius and ulna are connected at both the elbow and the wrist. They rotate around each other allowing for the pronation and supination of the hand.