The structure indicated is the trapezoid bone
of the hand.
There are three groups
of bones in the hand:
- Carpal bones (8 in total)
- Metacarpal bones
The carpal bones are separated into two rows:
- Proximal row
- Distal row
The trapezoid bone
is located in the distal row
of carpal bones. There are four bones
in the distal row:
It’s easy to confuse the location of the trapezoid with the adjacent and similarly named trapezium bone. A way to remember where the trapezium is located is that trapezi-UM
rhymes with thUMB
, and therefore articulates with the 1st
metacarpal of the thumb, the trapezoid bone lies just medial to it.
Learn more about the bones of the hand
in this anatomy tutorial.