The olecranon and coronoid processes form the borders of which structure?

The olecranon and coronoid processes form the borders of which structure?

• A. Olecranon Fossa
• B. Intercondylar Notch
• C. Trochlear Notch
• D. Radial Notch

Answer: (C)

The big idea is that the trochlear notch is formed by two projections of the ulna—the olecranon at the back and the anterior coronoid process. Together they create a deep, crescent-shaped notch that articulates with the trochlea of the humerus, making the main hinge joint of the elbow. When the elbow flexes, the coronoid process sits in the coronoid fossa of the humerus; when it extends, the olecranon moves into the olecranon fossa. This borders the trochlear notch, and it’s distinct from other nearby features like the olecranon fossa on the humerus, or the radial notch on the ulna.

The big idea is that the trochlear notch is formed by two projections of the ulna—the olecranon at the back and the anterior coronoid process. Together they create a deep, crescent-shaped notch that articulates with the trochlea of the humerus, making the main hinge joint of the elbow. When the elbow flexes, the coronoid process sits in the coronoid fossa of the humerus; when it extends, the olecranon moves into the olecranon fossa. This borders the trochlear notch, and it’s distinct from other nearby features like the olecranon fossa on the humerus, or the radial notch on the ulna.