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
By Bony Landmarks
- Coronoid process and ulnar tuberosity
- Lateral aspect of olecranon process
- 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
