Ulnar notch of the radius
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|Ulnar notch of the radius|
Bones of left forearm. Anterior aspect. (Ulnar notch visible but not labeled.)
|Latin||incisura ulnaris radii|
"Sigmoid cavity" redirects here. For Greater sigmoid cavity, see Trochlear notch.
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.
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