World Library  
Flag as Inappropriate
Email this Article

Second metacarpal bone

Article Id: WHEBN0004405796
Reproduction Date:

Title: Second metacarpal bone  
Author: World Heritage Encyclopedia
Language: English
Subject: Flexor carpi radialis muscle, Third metacarpal bone, Fifth metacarpal bone, Fourth metacarpal bone, Extensor carpi radialis longus muscle
Publisher: World Heritage Encyclopedia

Second metacarpal bone

Second metacarpal bone
Second metacarpal of the left hand (shown in red). Palmar view.
The second metacarpal. (Left.)
Latin os metacarpale II
Gray's p.228
MeSH A02.835.232.087.319.550
FMA FMA:23900
Anatomical terms of bone

The second metacarpal bone (metacarpal bone of the index finger) is the longest, and its base the largest, of all the metacarpal bones.[1]


  • Human anatomy 1
  • Evolution 2
  • Ossification 3
  • Additional images 4
  • See also 5
  • Notes 6
  • References 7

Human anatomy

Its base is prolonged upward and medialward, forming a prominent ridge.[1]

It presents four articular facets, three on the upper surface and one on the ulnar side:[1]

  • Of the facets on the upper surface:
    • the intermediate is the largest and is concave from side to side, convex from before backward for articulation with the lesser multangular;
    • the lateral is small, flat and oval for articulation with the greater multangular;
    • the medial, on the summit of the ridge, is long and narrow for articulation with the capitate.
  • The facet on the ulnar side articulates with the third metacarpal.

The extensor carpi radialis longus muscle is inserted on the dorsal surface and the flexor carpi radialis muscle on the volar surface of the base.[1]

This bone is often the most prone to damage from fast bowlers in cricket, as it is furthest down the bat handle on both left- and right-handers, and as such is in danger of being struck by balls that are pitched short.[2]


The articulation between the second metacarpal and the capitate is considered uniquely specialized in hominids. On the second metacarpal, the facet for the capitate is directed proximally, almost perpendicular to the facet for the third metacarpal, while the corresponding facet on the capitate is oriented distally. This is to receive compressive forces generated by the pad-to-pad opposition between the thumb and the index finger. In contrast, in apes, including fossil apes such as Dryopithecus and Proconsul, these facets are oriented in a sagittal plane. In quadrupedal monkeys these facets are oriented slightly differently due to their locomotor behaviour. [3]

Interestingly, in Oreopithecus, a Miocene hominid that went extinct , the orientation of the facet on the second metacarpal is similar to human conditions — an indication that it had the capability of pad-to-pad precision grip. Oreopithecus also lacks the waisted capitate associated with apes and climbing still present in Australopithecus. [3]


The metacarpal bone of the index finger has two centres of ossification: a primary centre in the shaft and a secondary centre in the head. This contrasts to the first metacarpal bone where the secondary centre is found in the base. The ossification process begins in the shaft during prenatal life, and in the head between 11th and 22nd months.[4]

Additional images

See also


  1. ^ a b c d Gray's Anatomy (1918). See infobox.
  2. ^ Laven , Kate. "West Indies' Courtney Walsh still in love with cricket." Daily Telegraph [London] 5 May 2009 Print.
  3. ^ a b Moyà-Solà, Köhler & Rook 1999, pp. 315–6
  4. ^ 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.


  • Moyà-Solà, Salvador; Köhler, Meike; Rook, Lorenzo (5 January 1999). "Oreopithecus"Evidence of hominid-like precision grip capability in the hand of the Miocene ape . PNAS 96 (1): 313–317.  
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.