Triquetral at a glance
- Also called
- Triquetrum
- What it is
- A pyramid-shaped carpal bone on the ulnar side of the proximal row.
- Location
- Lies on the ulnar side of the proximal row, between the lunate and the hamate, with the pisiform on its palmar surface. It sits distal to the ulna, separated from it by an articular disc.
- Function
- Contributes to the wrist joint and supports the pisiform.
- Body system
- Skeletal · paired (left and right)
- FMA ID
- FMA24440 (Foundational Model of Anatomy)
Key facts
- The pisiform sits on its palmar surface.
- It is often called the triquetrum.
Clinical relevance
Dorsal avulsion fractures are a common triquetral injury.
Structures next to the triquetral
The nearest named structures in the 3D model, measured from the centre of each part:
- Hamate · skeletal
- Dorsal carpal branch of ulnar artery · cardiovascular
- Pisiform · skeletal
- Lunate · skeletal
- Superficial palmar arterial arch · cardiovascular
- Capitate · skeletal
- Deep palmar arch · cardiovascular
- Scaphoid · skeletal
- Trapezoid · skeletal
- Opponens digiti minimi of hand · muscular
References
- Foundational Model of Anatomy: Triquetral (FMA24440). EMBL-EBI Ontology Lookup Service.
- OpenStax. Anatomy and Physiology 2e, §7.1 Divisions of the Skeletal System. Rice University, 2022.
- Mitsuhashi N. et al. (2009). BodyParts3D: 3D structure database for anatomical concepts. Nucleic Acids Research 37, D782–D785. Data © The Database Center for Life Science, CC BY 4.0.
Related anatomy
Explore the whole body in the interactive 3D human anatomy model, or browse the A–Z list of human structures.