Capitulum

Definition

The capitulum is a round knob-like structure on the distal end of the humerus that articulates with the radius in the forearm. It facilitates elbow and forearm movement by connecting to the radius.

Related terms

Humerus:

The long bone in the upper arm that extends from the shoulder to the elbow, serving as a structural component for arm movement.

Radius:

One of the two large bones of the forearm, which extends from the lateral side of the elbow to the thumb side of the wrist, crucial for arm rotation.

Pronation:

A rotational movement of the forearm where the hand and upper arm are turned inwards, with capitulum aiding this motion