The |humerus|, |radius|, and |ulna| join to form the |elbow joint|. This joint features a number of complex prominences which serve as attachment sites of ~ligaments~ and muscles, serving to control the flexibility and ~adduction~ of the bones about the elbow. The articulation of the elbow is called a hinge joint, because, like a hinge on a door, the joint only permits ~flexion~ in a single plane.
