Ulnar Tuberosity

tuberositas ulnae

The ulnar tuberosity is a rough area on the front of the upper ulna, just below the coronoid process. The brachialis muscle, the main elbow flexor, inserts here. It can be felt only indirectly, as it lies deep in the front of the elbow beneath the brachialis.

Anatomical Data

Structure & Landmarks

Articulations	No joint; insertion site of brachialis
Landmarks	Immediately distal to the coronoid process Insertion of brachialis Oblique cord of the forearm attaches nearby on its lateral side
Ossification	Part of the proximal ulna, which ossifies from the primary centre in the shaft; the coronoid region ossifies by extension from this centre.

Clinical Relevance

Clinical Notes

The ulnar tuberosity is the anchor point for brachialis, so strong resisted elbow flexion or forced extension can strain the muscle at this insertion, as in climbers. Myositis ossificans (bone formation within muscle) after elbow injury most commonly affects the brachialis just above this insertion and can severely limit elbow motion. Coronoid fractures can extend into the tuberosity region and affect the brachialis attachment.

Pathology

Common Injuries & Conditions

Brachialis Strain

Injury of the brachialis at or near its insertion on the ulnar tuberosity, causing deep pain at the front of the elbow with resisted flexion; often seen in climbers.

Myositis Ossificans of the Brachialis

Heterotopic bone forming in the brachialis after elbow trauma, which may restrict elbow flexion and extension.

Explore

More in Forearm

Browse all of Forearm →