Pyramidal bone

Pyramidal Bone

The Pyramidal Bone (also known as the Os Pyramidale or Triquetral Bone) is a bone in the wrist that forms part of the carpus, the eight small bones that make up the wrist. It is located in the proximal row of the carpus, between the lunate and the pisiform.

Structure

The pyramidal bone is roughly pyramid-shaped, and has three surfaces: volar (palm-side), dorsal (back-side), and ulnar (side towards the little finger). It articulates with three other bones: the lunate, the pisiform, and the hamate.

Function

The pyramidal bone, like the other carpal bones, contributes to the flexibility and movement of the wrist. It is involved in movements such as flexion, extension, abduction, and adduction of the wrist.

Clinical Significance

Injuries to the pyramidal bone are relatively rare, but can occur as a result of trauma to the wrist. Fractures of the pyramidal bone can lead to pain, swelling, and limited movement of the wrist. Treatment typically involves immobilization of the wrist, and in some cases, surgery may be required.

See Also

• Carpus
• Wrist
• Lunate bone
• Pisiform bone
• Hamate bone