Final answer:
The olecranon process of the ulna is the bony prominence of the elbow, which articulates with the humerus and is involved in the elbow joint's movement.
Step-by-step explanation:
The olecranon process of the ulna forms the bony prominence that is commonly known as the elbow, or the 'funny bone' when bumped. This process serves as the insertion point for the triceps brachii muscle and creates the bony tip of the elbow.
The olecranon process articulates with the olecranon fossa of the humerus when the forearm is extended. The ulna, along with the radius, forms the forearm and is involved in the articulation with the distal end of the humerus to create the elbow joint.
This union allows for a range of movements at the elbow, including flexion and extension. Distally, the ulna participates in forming the distal radioulnar joint.