Trapezoid Bone
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
- Phalanges
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:
- Trapezium
- Trapezoid
- Capitate
- Hamate
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 th
UMB, and therefore articulates with the 1
st metacarpal of the thumb, the trapezoid bone lies just medial to it. Learn more about the
bones of the hand in this anatomy tutorial.