Trochlear notch

Definition

The trochlear notch is a large, concave indentation located at the proximal end of the ulna, which articulates with the trochlea of the humerus to form the elbow joint. This structure allows for the wide range of motion necessary for forearm movement.

Related terms

Ulna:

The longer and larger bone of the forearm, which runs parallel to the radius and interacts with the humerus at the elbow joint through the trochlear notch.

Humerus:

A long bone in the upper arm that articulates with the ulna at its distal end via the trochlea to form part of the elbow joint.

Elbow Joint:

A hinge type synovial joint formed between three bones - the humerus of the upper arm, and the ulna and radius of the forearm, allowing for flexion and extension of the forearm