In the human arm, the humeral trochlea is the medial portion of the articular surface of the elbow joint which articulates with the trochlear notch on the ulna in the forearm.

In humans, these two fossae, the most prominent in the humerus, are occasionally transformed into a hole, the supratrochlear foramen,[2] which is regularly present in, for example, dogs.

During elbow flexion, the vertical anterior part of the trochlea keeps the upper arm and forearm aligned (when viewed in front).

Very rarely, the anterior part is oblique in the opposite direction, resulting in the hand's resting on the chest during flexion.

While the trochlea together with its associated fossae almost covers a 360° angle, the trochlear notch on the ulna forms a 190° arc and the gap in between allows flexion and extension at the elbow.