<Tr> <Th> FMA </Th> <Td> 33773 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terms of bone (edit on Wikidata) </Td> </Tr> <P> 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 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 . </P> <P> The head of the radius is shaped to articulate with a complex of articular surfaces during both flexion - extension at the elbow and supination - pronation in the forearm: </P>

The head of the radius articulates with which structure and bone