Fifth metacarpal bone

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Fifth metacarpal bone
Fifth metacarpal bone (left hand) 01 palmar view.png
Fifth metacarpal of the left hand (shown in red). Palmar view.
Gray233.png
The fifth metacarpal. (Left.)
Latin os metacarpale V
Gray's p.228
MeSH Metacarpal+Bones
FMA 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[edit]

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[edit]

A fracture of the fourth and/or fifth metacarpal bones transverse neck secondary due to axial loading is known as a boxer's fracture.[1] The fifth metacarpal bone is the most common bone to be injured when throwing a punch.

Ossification[edit]

The ossification process begins in the shaft during prenatal life, and in the head between 11th and 37th months[2]

Additional images[edit]

See also[edit]

References[edit]

  1. ^ Shultz, S. J., Houglum, P. A., Perrin, D. H. (2010). Examination of Musculoskeletal Injuries. Chicago: Human Kinetics
  2. ^ Balachandran, Ajay; Anooj Krishna; Moumitha Kartha; Libu G. K.; Liza John; Krishnan B (30 December 2013). "A Study of Ossification of heads of 2nd to 5th Metacarpals in Forensic Age Estimation in the Kerala Population". Journal of Evolution of Medical and Dental Sciences 2 (52): 10165–10171. Retrieved 26 December 2013. 

This article incorporates text from a public domain edition of Gray's Anatomy.