Proximal and Distal Aspects
The ulna is broader proximally, and narrower distally.
Proximally, the ulna has a bony process, the olecranon process, a hook-like structure that fits into the olecranon fossa of the humerus. This prevents hyperextension and forms a hinge joint with the trochlea of the humerus. There is also a radial notch for the head of the radius, and the ulnar tuberosity to which muscles attach.
At the distal end of the ulna is a styloid process.
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