The two structures that the radial head
pivot during turning are the capitulum and radial notch of humerus. The
Capitulum is known as the elbow joint consist of the upper arm
bone called the humerus and two forearm bones called the radius and the
ulna. The Radial Notch of Humerus is a slender, oblong, articular
depression on the adjacent side of the coronoid process.
