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Encyclopedia > Carpal bone

In human anatomy, 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.

Mnemonics that can be useful for remembering the carpal bones are:

  • "Scared Lovers Try Positions That They Cannot Handle"
  • "Students Like The Professor To Teach Complex Hypotheses"
  • "She Likes To take Prostitutes To The Calley Hotel" (to take representing the 2 T's of Triquetrum)

See also


  Results from FactBites:
 
Carpus - Wikipedia, the free encyclopedia (551 words)
In tetrapods, the carpus is the cluster of bones in the hand between the radius and ulna and the metacarpus.
The carpal bones have evolved differently in different animals (for example in some macropods, the scaphoid and lunar bones are fused into the scapholunar bone)[1].
Trapezium (bone) articulates with the metacarpal of the thumb.
Carpal tunnel - Wikipedia, the free encyclopedia (387 words)
The term 'carpal tunnel' is also used quite commonly to refer to 'carpal tunnel syndrome' which is a condition where the median nerve is pinched within the tunnel and causes pain and/or numbness of the wrist/hand, once thought to be a result of repetitive motion such as painting or typing.
The carpal tunnel is a fibro-osseous tunnel on the palmar surface of the carpal bones which transmits a number of tendons (flexor pollicis longus, flexor digitorum superficialis and profundus) and the median nerve from the forearm into the hand.
It attaches to the scaphoid tubercle and ridge of the trapezium laterally (radially), and to the pisiform and hook of the hamate medially (ulnarly).
  More results at FactBites »


 

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