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
TA A02.4.05.019
FMA 75082
Anatomical terminology
"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.


This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)