掌骨 - Os metacarpale

描述

The metacarpal bones are typically five long bones at the distal end of the thoracic limb. They are sometimes called thoracic metapodium.

They are numerated in a mediolateral sequence from Mc I to McV.

The metacarpal bones have all the same segments:

  • A proximal extremity (base) bearing an articular surface for the distal row of the carpal bones and additional facets towards its neighbours.
  • A shaft (body) with a palmar and a dorsal surface, and medial and lateral borders.
  • A distal extremity (head) with a trochlea that articulates with the proximal phalanx.

The number of metacarpal bones may be reduced. For example, in the horse, only the third ray (cannon bone) is functional, with second and fourth metacarpal bones (splint bones) bearing no weight.


Text by Antoine Micheau, MD - Copyright IMAIOS
Veterinary Anatomy of Domestic Mammals: Textbook and Colour Atlas, Sixth Edition - Horst Erich König, Hans-Georg Liebich - Schattauer - ISBN-13: 978-3794528332

影像

下载vet-Anatomy

手机和平板用户可以在Appstore或GooglePlay下载

vet-Anatomy 在Appstore vet-Anatomy 在Googleplay