Left Radius and Ulna (Anterior view)
   

1.Radius

 
  2.Ulna
  3.Radial head
 
4.Radial tuberosity
 
  5.Styloid process of Radius
 
  6.Ulnar notch
 
  7.Styloid process of Ulna
 
  8.Coronoid process         Radius and Ulna Posterior view
 

The radius is attached at its proximal end to the humerus. The other bone of the forearm is the ulna. The head of the radius articulates with the capitulum of the humerus and Medially, it articulates with the radial fossa of the ulna. Distally, the radius articulates with the carpal bones of the wrist. When the radius moves, the hand moves with it!