The trochlear notch is located on which bone?

The trochlear notch is located on which bone?

• A. Radius
• B. Humerus
• C. Ulna
• D. Clavicle

Answer: (C)

The trochlear notch is a feature of the ulna. It’s the large, C-shaped depression at the proximal end of the ulna that articulates with the humerus’ trochlea, forming the elbow joint’s hinge motion. This notch, sometimes called the semilunar notch, sits on the anterior aspect of the ulna to allow a smooth articulation as the forearm bends and straightens. The radius does not have a trochlear notch; instead, it interacts with the ulna at the proximal radioulnar joint via the radial notch on the ulna. The clavicle is not involved in this articulation. So the bone bearing the trochlear notch is the ulna.

The trochlear notch is a feature of the ulna. It’s the large, C-shaped depression at the proximal end of the ulna that articulates with the humerus’ trochlea, forming the elbow joint’s hinge motion. This notch, sometimes called the semilunar notch, sits on the anterior aspect of the ulna to allow a smooth articulation as the forearm bends and straightens. The radius does not have a trochlear notch; instead, it interacts with the ulna at the proximal radioulnar joint via the radial notch on the ulna. The clavicle is not involved in this articulation. So the bone bearing the trochlear notch is the ulna.