Triquetrum

A small, pyramid-shaped bone located in the wrist that plays a crucial role in wrist function and stability.

The triquetrum is one of the eight carpal bones in the human wrist. It is situated adjacent to the pisiform bone and is positioned on the medial side of the wrist. This bone has three distinct surfaces, contributing to its name, which means 'three-cornered' in Latin.

Terminologia Anatomica

os triquetum

System

Skeletal system

Function

The triquetrum serves essential functions in facilitating wrist mobility and stability. It articulates with several other carpal bones—namely, the lunate, the pisiform, and the hamate—forming a vital link in the complex structure of the wrist joint. This bone plays a critical role during movements such as flexion, extension, and lateral deviation of the wrist. Its positioning allows for the development of proper range of motion necessary for gripping and manipulating objects. Furthermore, the triquetrum contributes to the overall biomechanics of the hand, supporting both functional and ergonomic activities through its alignment and interaction with adjacent bones.

Location

Located on the distal end of the forearm, the triquetrum is positioned in the proximal row of wrist bones, specifically near the ulnar side, adjacent to the pisiform bone. It lies beneath the skin, just below the base of the little finger and above the ulnar styloid process, making it one of the deeper structures in the wrist. The triquetrum's anatomical position is strategically significant, allowing it to play a pivotal role in the function and movement of the wrist, acting as a fulcrum during various hand movements.

Did You Know?

The triquetrum is one of the first carpal bones to ossify during development, typically appearing around the age of 12.
This bone can be involved in various types of wrist injuries, particularly fractures that can occur from falls onto an outstretched hand.
The triquetrum's articulations help accommodate the complex wrist movements that are essential for activities such as typing or playing musical instruments.