Ulna and Radius
Are two bones found in the forearm.
The radius is found on the side of the thumb.
The ulna on the side of the small finger has a projection called the olecranon process.
This has a sigmoid notch which articulates with the Humerus forming a hinge joint.
The olecranon offers a large surface for attachment of tendons, and overstretching of the forearm at the joint.
