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Dog · Bone · Thoracic limb

Radius

The weight-bearing bone of the forearm: a head at the elbow, a shaft crossed by the ulna, and a distal end carrying the carpus.

System
Bone
Region
Thoracic limb
Sides
Paired: left and right
Named parts
9

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 weight-bearing bone of the forearm: a head at the elbow, a shaft crossed by the ulna, and a distal end carrying the carpus.

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.

Proximal end

Head of the radiusCaput radii
The proximal end, whose fovea takes the capitulum of the humerus.Miller 2020, p. 315
Fovea of the headFovea capitis radii
The shallow cup on top of the head that the humeral capitulum turns in.Miller 2020, p. 315
Articular circumferenceCircumferentia articularis
The rim around the head that meets the radial notch of the ulna.Miller 2020, p. 315
Neck of the radiusCollum radii
The waist below the head.Miller 2020, p. 315
Radial tuberosityTuberositas radii
The roughening on the medial side below the neck, where the biceps brachii inserts.Miller 2020, p. 315

Body

Body of the radiusCorpus radii
The shaft, flattened front to back and curved along its length.Miller 2020, p. 315

Distal end

Carpal articular surfaceFacies articularis carpea
The distal face that carries the intermedioradial carpal bone.Miller 2020, p. 316
Ulnar notchIncisura ulnaris
The notch on the lateral side of the distal end that receives the ulna.Miller 2020, p. 316
Styloid processProcessus styloideus
The point on the medial side of the distal end, felt on the inside of the wrist.Miller 2020, p. 316

What it meets

Craniomedial forearm bone; articulates with humerus, ulna, radial carpal.

Bones it articulates with

Joints it forms

  • Humeroradial joint
  • Proximal radioulnar joint
  • Distal radioulnar joint
  • Antebrachiocarpal joint

Muscles and ligaments that take hold of it

  • Interosseous membrane of antebrachium

Measured on the specimen

What the radius 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
Radius
Latin (NAV)
Radius
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, Radius, PDF p. 310
  • 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