HELENE FOURNIE, ISM / SCIENCE PHOTO LIBRARY HELENE FOURNIE, ISM / SCIENCE PHOTO LIBRARY
Elbow extended and flexed. Illustration of the bones of the elbow seen in posterior (rear) view with the arm extended (left) and flexed (bent, right). The upper arm bone (humerus) articulates with the radius and ulna in the forearm, forming a hinge joint. Also shown here are the articular cartilages (blue), a form of hyaline cartilage that smooths and aids joint movements.
Model release not required. Property release not required.