Which carpal bone is located lateral to the pisiform?

The trapezium is the carpal bone situated lateral to the pisiform. To understand this anatomical arrangement, it's important to note the positioning of the carpal bones in the wrist. The pisiform itself is on the ulnar side of the wrist, and directly adjacent to it, on the radial side, is the trapezium.

The trapezium is significant because it articulates with the first metacarpal (the bone of the thumb) and allows for the thumb's opposition, an important motion for hand function. Its lateral position relative to the pisiform and its connections with other bones are critical in understanding wrist mechanics and hand movement.

Understanding the layout of the carpal bones, which includes names like scaphoid, hamate, and capitate, highlights that they are not adjacent to the pisiform on the lateral side, reinforcing why the trapezium is the correct choice.