It is the medial bone of the forearm. It articulates proximally with the humerus and radius and distally only with the radius. It is a long bone that has two epiphyses and a diaphysis.
- Olecranon – Large eminence that forms the tip of the elbow
- Trochlear Notch – Large depression formed by the olecranon and coronoid process and serves for articulation with the trochlea of the humerus
- Coronoid Process – Projects from the anterior and proximal part of the body of the ulna
- Radial Notch – Articulates with the radial head
- Ulnar tuberosity
- Head of Ulna – Rounded articular eminence located laterally
- Styloid Process – Located more medially and is more salient (non-articular)
It has three edges and three faces.
The Ulna articulates with two bones: the Humerus and the Radius.
| ULNA - ANTERIOR, POSTERIOR AND SIDE VIEWS|
|Source: SOBOTTA, Johannes. Atlas of Human Anatomy. 21 ed. Rio de Janeiro: Guanabara Koogan, 2000.|