Olecranon process: The elbow is the joint connecting

The elbow is the joint connecting the proper arm to the forearm. It is marked on the upper limb by the medial and lateral epicondyles, and the olecranon process. Structually, the joint is classed as a synovial joint, and functionally as a hinge joint. The olecranon is the proximal articular portion of the ulna. Along with the coronoid process, it forms the greater sigmoid (semilunar) notch which articulates with the humerus to provide flexion and extension of the elbow. Fractures of the olecranon are a relatively common injury in adults; its subcutaneous location leaves it vulnerable to injury from a direct blow. Fractures sustained range from simple nondisplaced fractures to complex open fracture dislocations. Olecranon fractures ... The olecranon process is a prominent, pointed projection at the upper end of the ulna, part of the elbow joint where it connects with the humerus. It serves as an attachment point for muscles and ligaments that enable elbow movement. The olecranon articulates with the humerus via the olecranon fossa on the humerus, which is situated over the posterior surface of the humerus. It is continuous with the coronoid process of the ulna via the trochlear or semilunar notch anteriorly.