The major portion of the cavity is located between the distal surfaces of the scaphoid, lunate, and triquetrum and proximal surfaces of the four bones of the distal row. Proximal prolongations of the cavity occur between the scaphoid and lunate and between the lunate and triquetrum.
The major part of the chamber is located between the outer edges of the scaphoid, lunate, and triquetrum and the inner edges of the four bones in the lower row. Proximal projections of the cavity occur between the scaphoid and lunate and between the lunate and triquetrum.