* The ulna is the medial bone of the forearm and is homologous with the fibula of the lower limb.
* It has an upper end with two processes, a shaft, and a narrow rounded lower end.
Olecranon:
* It is the curved projection on the back of the elbow that provides an attachment site for the triceps tendon.
Coronoid Process:
* It is located below the trochlear notch and provides an attachment site for the brachialis muscle.
Trochlear Notch:
* The upper end of the ulna presents a large C-shaped notch called the semilunar or trochlear notch.
* It articulates with the trochlea of the humerus to form the elbow joint.
Ulnar Tuberosity:
* It is a roughened prominence distal to the coronoid process that provides an attachment site for the brachialis muscle.
Radial notch:
* It accommodates the head of the radius at the proximal radioulnar joint.
Head of Ulna:
* It articulates with the articular disk of the distal radioulnar joint and has a styloid process.
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