Fifth metacarpal bone
| Fifth metacarpal bone | |
|---|---|
 The fifth metacarpal. (Left.) | |
 The five metacarpal bones, numbered. | |
| Details | |
| Identifiers | |
| Latin | os metacarpale V |
| FMA | 23903 |
| Anatomical terms of bone | |
The fifth metacarpal bone (metacarpal bone of the little finger or pinky finger) is the most lateral and second shortest of the metacarpal bones
Surfaces
It presents on its base one facet on its superior surface, which is concavo-convex and articulates with the hamate, and one on its radial side, which articulates with the fourth metacarpal.
On its ulnar side is a prominent tubercle for the insertion of the tendon of the extensor carpi ulnaris muscle.
The dorsal surface of the body is divided by an oblique ridge, which extends from near the ulnar side of the base to the radial side of the head.
The lateral part of this surface serves for the attachment of the fourth Interosseus dorsalis; the medial part is smooth, triangular, and covered by the extensor tendons of the little finger.
Clinical significance
This is the most common bone to be injured when throwing a punch. (See Boxer's fracture)
See also
- Metacarpus
- First metacarpal bone
- Second metacarpal bone
- Third metacarpal bone
- Fourth metacarpal bone
References
This article incorporates text in the public domain from page 228 of the 20th edition of Gray's Anatomy (1918)