Trochlea

Definition

The trochlea is a grooved, spool-like structure on the distal end of the humerus that articulates with the ulna in the elbow joint. It allows for the hinging movement of the forearm.

Related terms

Humerus:

The long bone in the upper arm that extends from the shoulder to the elbow.

Ulna:

One of the two long bones in the forearm, situated on the side opposite to the thumb and articulating with the humerus at the trochlea.

Elbow Joint:

A complex hinge joint between the end of the humerus and the ends of the radius and ulna, allowing for flexion and extension of the forearm