Ulnar notch of the radius
The articular surface for the ulna is called the ulnar notch (sigmoid cavity) of the radius; it is in the distal radius, and is narrow, concave, smooth, and articulates with the head of the ulna forming the distal radioulnar joint.
|Ulnar notch of the radius|
Bones of left forearm. Anterior aspect. (Ulnar notch visible but not labeled.)
|Latin||incisura ulnaris radii|