What Is The Wrist?

Posted on 25 Oct 2015 23:05

The part of the body that most people think of as their wrist is actually the distal end of their radius and ulna bones, or, in other words the end of their arm bones.

The wrist itself, however, also called the carpus from the latin, is actually made up of eight small bones called carpal bones.

These bones are usually named as part of two rows of bones, one proximal to the radius and ulna and one distal. It is the proximal row, therefore that actually articulates with the radius and ulna making what we think of as the wrist joint.

I wrote about this in the blog post Are Weight Training Images Picture Perfect/ Wrapping the Wrists.

The diagram below shows the carpal bones each with a separate color and letter assigned. Beneath the diagram is the name of the bones designated by their letters.

eight carpal bones of wrist (carpus) diagram

image by Mintz l via
wikipedia

Proximal:

A=Scaphoid, B=Lunate, C=Triquetral , D=Pisiform

Distal:

E=Trapezium, F=Trapezoid, G=Capitate, H=Hamate



And here we have a photo of a right posterior view of the radius ulna and carpal articulation as well as a partial view of metacarpals:


image of right posterior bones of human wrist showing the articulation of ulna radius and eight carpal bones plus metacarpals

Right posterior view of human wrist showing the distal radius
and ulna and the eight carpal bones of the carpus (wrist)


image of right palmar aspect (anterior) bones of human wrist showing the articulation of ulna radius and eight carpal bones plus metacarpals

Right palmar (anterior) view of human wrist showing the distal
radius and ulna and the eight carpal bones of the carpus (wrist)


Definitions

Proximal = closest to the midline or center) or point of origin.

Distal = furthest from the midline (or center) or point of origin.


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