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Dog · Bone · Thoracic limb

Intermedioradial carpal bone

Os carpi intermedioradiale

The largest carpal bone, formed by the fusion of the radial and intermediate elements; it carries most of the load from the radius.

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
The largest carpal bone, formed by the fusion of the radial and intermediate elements; it carries most of the load from the radius.

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.

Intermedioradial carpal boneOs carpi intermedioradiale
The largest carpal bone: the radial, central and intermediate elements fused into one.Miller 2020, p. 325
Proximal surface
Largely articular, for the trochlea of the radius.Miller 2020, p. 325
Distal surface
Meets all four bones of the distal row.Miller 2020, p. 325
Lateral surface
Articulates extensively with the ulnar carpal; the bone is about twice as wide across as it is deep.Miller 2020, p. 325

What it meets

Largest carpal; proximal row, medial; articulates with radius.

Bones it articulates with

  • Radius
  • Ulnar carpal bone
  • Carpal bone I
  • Second carpal bone
  • Third carpal bone
  • Fourth carpal bone
  • Sesamoid abductor digiti 1

Joints it forms

  • Antebrachiocarpal joint

Muscles and ligaments that take hold of it

  • Medial collateral ligament of carpus

Measured on the specimen

What the intermedioradial 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
Intermedioradial carpal bone
Latin (NAV)
Os carpi intermedioradiale
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