radial notch

{{Short description|Dent of the ulna receiving the radius}}

{{Infobox bone

| Name = Radial notch

| Latin = incisura radialis ulnae

| Image = Gray212.png

| Width = 200

| Caption = Upper extremity of left ulna. Lateral aspect. (Radial notch visible at center top.)

| Image2 =

| Caption2 =

}}

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.