Ulna - Ulna

Anatomical hierarchy

General terms > Osteology > Appendicular skeleton > Bones of the thoracic limb > Skeleton of forearm > Ulna

Anatomical children

Antebrachial interosseous space Body [Shaft] of ulna Distal antebrachial interosseous space Head of ulna Lateral coronoid process Medial coronoid process Olecranon Proximal antebrachial interosseous space Radial notch Trochlear notch Tuberosity of ulna

Translations

Description

The ulna is the caudolateral bone of forearm, divide into three segments:

  • Proximal extremity with the olecranon
  • Body (shaft) of ulna
  • Distal extremity with the head of ulna.

The development of ulna varies considerably between species due to the evolution of rotation movement in forearm:

  • In human, the ulna is well developped due to an important rotational movement (pronation and suppination).
  • In carnivores, the movement is quite limite but the radius and ulna remains separate.
  • In the pigs, the rotation is prevented by firm soft tissue bridging the interosseous space.
  • In horses and ox, there is no movement and the two bones are fused.

 


Text by Antoine Micheau, MD - Copyright IMAIOS

Images

Illustrations Left lateral view image Ulna
Illustrations Cranial view image Ulna
Illustrations Lateral view image Ulna
Illustrations Caudal view image Ulna
CT Transversal image Ulna
CT Sagittal image Ulna
CT Dorsal image Ulna
3D 3D - Bones image Ulna
CT Transversal image Ulna
CT Sagittal image Ulna
CT Dorsal image Ulna
3D 3D image Ulna
Radiography Thoracic limb image Ulna
CT Transversal image Ulna
CT Sagittal image Ulna
CT Dorsal image Ulna
3D 3D - Bones image Ulna
Illustrations Thoracic limb image Ulna
Illustrations Thoracic limb image Ulna
Illustrations Thoracic limb image Ulna
Illustrations Skeleton image Ulna
Illustrations Thoracic limb image Ulna
Illustrations Skeleton image Ulna
Illustrations Thoracic limb image Ulna
Illustrations Thoracic limb image Ulna
Radiography Thoracic limb image Ulna

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