Illustrations
Bony Landmarks
Coronoid process #
Anterior projection distal to the trochlear notch that helps form the elbow joint and provides attachment for the Brachialis.
Head of ulna #
Distal rounded end articulating with the radius and the wrist's fibrocartilage complex.
Interosseous border #
Sharp lateral ridge along the shaft where the interosseous membrane attaches, linking ulna to radius.
Olecranon process #
Large posterior hook forming the elbow point; insertion site for Triceps and attachment for Anconeus and Flexor Carpi Ulnaris.
Radial notch #
Shallow lateral depression receiving the head of the 🦴 radius to form the proximal radioulnar joint.
Styloid process #
Pointed distal projection for the ulnar collateral ligament of the wrist.
Supinator crest #
Ridge on the proximal lateral ulna providing origin for the supinator.
Trochlear notch #
C-shaped articular surface below the olecranon that grips the humeral trochlea.
Ulnar tuberosity #
Rough area below the coronoid process on the anterior shaft where Brachialis and flexor digitorum profundus attach.
Muscle Origins #
By Bony Landmarks
Coronoid Process (Medial border)
- Pronator Teres (ulnar head)
Posterior border of ulnar shaft
- Flexor Carpi Ulnaris (ulnar head)
Shaft (interosseous border)
- Extensor indicis (via interosseous membrane attachment)
Shaft (Posterior surface)
- Extensor pollicis longus (via interosseous membrane attachment)
Supinator crest (proximal ulna)
- Supinator
Muscle Insertions #
Coronoid process and ulnar tuberosity
Lateral olecranon
Olecranon process
- Triceps (all heads)
Posterior border of ulna
- Flexor Carpi Ulnaris (via pisiform, hamate, 5th metacarpal)
Ulnar shaft (anteromedial surface)
- Flexor Digitorum Superficialis (via intermediate phalanges; indirect insertion)
Ulnar tuberosity (anteromedial shaft)
- Flexor Digitorum Profundus (ulnar half)
Examples
Styloid Process
