Radial notch

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Radial notch
Upper extremity of left ulna. Lateral aspect. (Radial notch visible at center top.)
Latin incisura radialis ulnae
Gray's p.215
Anatomical terms of bone

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.

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This article incorporates text from a public domain edition of Gray's Anatomy.