part of part of head of radius UBERON:0001012 SCTID:181941003 FMA:33773 radial head galen:HeadOfRadius Wikipedia:Head_of_radius The head of the radius has a cylindrical form, and on its upper surface is a shallow cup or fovea for articulation with the capitulum (or capitellum) of the humerus. The circumference of the head is smooth; it is broad medially where it articulates with the radial notch of the ulna, narrow in the rest of its extent, which is embraced by the annular ligament. The deepest point in the fovea is not axi-symmetric with the long axis of the radius, creating a cam effect during pronation and supination[WP]. elbow joint proximal epiphysis of radius zone of long bone zone of bone organ