Ulna (left) (Ulna)
Educational content only — not medical advice.
Anatomy
The medial forearm bone on the little-finger side. Its trochlear notch hinges on the humerus, making the elbow a pure hinge for flexion/extension, and it is the pivot around which the radial head rotates.
Clinical notes
A fracture of the ulnar shaft combined with dislocation of the radial head is a Monteggia fracture — every ulnar fracture warrants checking the radial head.
Related structures
Educational references
FAQ
What is the role of the Ulna (left)?
The medial forearm bone on the little-finger side. Its trochlear notch hinges on the humerus, making the elbow a pure hinge for flexion/extension, and it is the pivot around which the radial head rotates.
Why is the Ulna (left) clinically important?
A fracture of the ulnar shaft combined with dislocation of the radial head is a Monteggia fracture — every ulnar fracture warrants checking the radial head.
Source & license
Derived from Z-Anatomy (Gauthier Kervyn et al.), CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/); upstream geometry from BodyParts3D, © The Database Center for Life Science. license details