Understanding the Bones of Your Arm: Humerus, Radius & Ulna

Humerus: The long bone of the upper arm that extends from the shoulder to the elbow.

Radius: One of the two long bones of the forearm. It is located on the thumb side of the forearm and runs from the elbow to the wrist.

Ulna: The other of the two long bones of the forearm. It is located on the pinky side of the forearm and runs from the elbow to the wrist.