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Dog · Bone · Thoracic limb

Ulna

An olecranon for the triceps, a trochlear notch gripping the humeral condyle, and a shaft tapering to the styloid process at 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
An olecranon for the triceps, a trochlear notch gripping the humeral condyle, and a shaft tapering to the styloid process at 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

OlecranonOlecranon
The lever at the back of the elbow that the triceps pulls on; the point of the elbow.Miller 2020, p. 316
Trochlear notchIncisura trochlearis
The half-moon grip that closes round the trochlea of the humerus.Miller 2020, p. 316
Anconeal processProcessus anconeus
The hook at the top of that notch, which drops into the olecranon fossa.Miller 2020, p. 317
Medial coronoid processProcessus coronoideus medialis
The medial lip at the bottom of the notch.Miller 2020, p. 317
Lateral coronoid processProcessus coronoideus lateralis
The lateral lip at the bottom of the notch.Miller 2020, p. 317
Radial notchIncisura radialis
The facet below the coronoid processes that the head of the radius turns against.Miller 2020, p. 316

Body

Body of the ulnaCorpus ulnae
The shaft, three-sided above and tapering as it runs down beside the radius.Miller 2020, p. 317

Distal end

Styloid processProcessus styloideus
The point at the distal end, on the lateral side of the wrist.Miller 2020, p. 316
Articular circumferenceCircumferentia articularis
The facet at the distal end that meets the ulnar notch of the radius.Miller 2020, p. 318

What it meets

Caudolateral forearm bone; olecranon; articulates with humerus, radius, ulnar and accessory carpals.

Bones it articulates with

Joints it forms

  • Humeroulnar joint
  • Proximal radioulnar joint

Muscles and ligaments that take hold of it

  • Triceps brachii
  • Interosseous membrane of antebrachium

Measured on the specimen

What the ulna 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
Ulna
Latin (NAV)
Ulna
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, Ulna, PDF p. 316
  • 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