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Carpal bone

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The carpal bones are the bones of the human wrist.

There are eight of them altogether, and they can be thought of as forming two rows of four.

Proximal Row

  • Scaphoid (or navicular) - this bone, with the lunate, articulates with the radius of the arm.
  • Lunate - articulates with the radius and the capitate.
  • Triquetrum - on the ulnar side of the hand, but does not articulate with the ulna.
  • Pisiform - a sesamoid bone that lies anterior to (closer to the palm than) the triquetrum.

Distal Row

  • Trapezium - the most lateral bone of this row. It articulates with the metacarpal of the thumb.
  • Trapezoid - articulates with the 2nd metacarpal.
  • Capitate - articulates with the metacarpal of the middle finger.
  • Hamate - articulates with the metacarpals of the 4th and 5th fingers. It has a projection called a hook.



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