|Bone: Radial notch|
|Upper extremity of left ulna. Lateral aspect. (Radial notch visible at center top.)|
|Latin||incisura radialis ulnae|
|Gray's||subject #52 215|
The radial notch of the ulna (lesser sigmoid cavity) is a narrow, oblong, articular depression on the lateral side of the coronoid process; it receives the circumferential articular surface of the head of the radius.
It is concave from before backward, and its prominent extremities serve for the attachment of the annular ligament.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.