Instead, it is connected to and articulates with the ulna through the Triangular fibrocartilage disc[1] and ligament, which forms part of the ulnocarpal joint capsule.

To facilitate its palpation in an exam, the hand must be radially deviated so that the triquetrium moves out from under the ulnar styloid process.

The inferior surface, directed lateralward, is concave, sinuously curved, and smooth for articulation with the hamate.

The lateral surface, the base of the pyramid, is marked by a flat, quadrilateral facet, for articulation with the lunate.

The medial surface, the summit of the pyramid, is pointed and roughened, for the attachment of the ulnar collateral ligament of the wrist.