Radial notch of the ulna

Definition

The radial notch of the ulna is a small, shallow depression located on the lateral side of the coronoid process of the ulna, where it articulates with the head of the radius to form part of the proximal radioulnar joint. This structure allows for the pivoting motion necessary for pronation and supination of the forearm.

Related terms

Ulna:

A long bone in the forearm that runs parallel to the radius and articulates with it at both ends, forming part of the elbow joint at its larger end.

Radius:

The shorter of the two long bones in the forearm, positioned on the thumb side, which works closely with the ulna to facilitate arm movement.

Proximal Radioulnar Joint:

A pivot type joint between the head of radius and radial notch of ulna allowing rotation of forearm for pronation and supination movements