Radial notch
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| Radial notch | |
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| Upper extremity of left ulna. Lateral aspect. (Radial notch visible at center top.) | |
| Latin | incisura radialis ulnae |
| Gray's | subject #52 215 |
| Dorlands/Elsevier | i_05/12447480 |
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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