- The ulna is the medial bone of the forearm.
- The ulna articulates with:
- the humerus proximally, forming the elbow (humeroulnar) joint.
- the radius laterally, forming the three radioulnar joints.
- the carpals distally, forming the wrist joint.
NOTES:
- The ulna forms the principal articulation with the humerus at the elbow (humeroulnar) joint.
- The ulna is small and less functionally important at the wrist joint.
Anterior view of the ulna and radius on the right side of the body.
Posterior view of the ulna and radius on the right side of the body.
Medial view of the ulna and radius on the right side of the body.
Lateral view of the ulna on the right side of the body. Note: The radius has been removed.
A proximal (superior) view of the ulna and radius on the right side of the body.
A distal (inferior) view of the ulna and radius on the right side of the body.
