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Dog · Bone · Thoracic limb

Accessory carpal bone

Os carpi accessorium

Projects backward from the lateral carpus; the flexor carpi ulnaris and the ulnaris lateralis pull on it and the palmar carpal ligaments anchor to it.

System
Bone
Region
Thoracic limb
Sides
Paired: left and right
Named parts
4

Where it runs from and to

A muscle is told apart from its neighbours by what it takes hold of at each end, which is also what decides what it does when it shortens.

Action
Projects backward from the lateral carpus; the flexor carpi ulnaris and the ulnaris lateralis pull on it and the palmar carpal ligaments anchor to it.

Written for Vetomica in its own words from the standard reference anatomy of the dog; the books it was checked against are listed below.

Named parts

What to look for on the bone, and what each part is called in the Nomina Anatomica Veterinaria.

Accessory carpal boneOs carpi accessorium
A truncated rod lying on the palmar side of the ulnar carpal, with both ends enlarged.Miller 2020, p. 325
Basal enlargement
The thickened end carrying a slightly saddle-shaped surface for the ulnar carpal.Miller 2020, p. 325
Articular area for the ulnar styloid process
The smaller, transversely hollowed face above it, set off from the saddle by a sharp angle.Miller 2020, p. 325
Free end
The thickened palmar end, which overhangs a little; it ossifies from a centre of its own.Miller 2020, p. 325

What it meets

Projects palmarly from the lateral carpus; insertion of M. flexor carpi ulnaris.

Bones it articulates with

Muscles and ligaments that take hold of it

  • Flexor carpi ulnaris
  • Extensor carpi ulnaris
  • Accessory carpal ligaments
  • Accessoriometacarpal ligaments

Measured on the specimen

What the accessory carpal bone is in contact with in the model itself, with the share of the other structure’s surface it covers. A contact is not always a joint: bones that simply lie against one another are in this list too.

Measured on the left side.

Terminology

English
Accessory carpal bone
Latin (NAV)
Os carpi accessorium
Status
A valid term in the Nomina Anatomica Veterinaria

References

Where to read this structure in full, and where the named parts above were read.

  • Miller 2020Miller 2020, ch. 4 The Skeleton, Carpus, PDF p. 324-326
  • König & Liebich 2020skeleton of the thoracic limb, p. 171-184
  • Dyce 2017ch. 16 Forelimb of the Dog and Cat, p. 464 (clavicle p. 69)
  • NAV 2017Osteologia