The ulna is one of the two long bones in the forearm, located on the side opposite to the thumb. It extends from the elbow to the smallest finger and runs parallel to the radius.
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The ulna forms a hinge joint with the humerus at the elbow, allowing for flexion and extension of the arm.
It is longer than the radius and primarily responsible for forming the elbow joint.
The ulna has three regions: proximal end (nearer to elbow), shaft, and distal end (nearer to wrist).
Its proximal end features structures such as the olecranon and trochlear notch which interact with other bones.
Fractures of the ulna are commonly referred to as 'nightstick fractures' due to their association with defensive injuries.