Basal View of the Right Hemisphere. The temporal operculum has been removed to expose the frontal and parietal opercula. 1, lateral orbital gyrus; 2, anterior orbital gyrus; 3, medial orbital gyrus; 4, posterior orbital gyrus; 5, rectus gyrus; 6, pars triangularis; 7, pars opercularis; 8, precentral gyrus; 9, postcentral gyrus; 10, supramarginal gyrus. Asterisk, pars orbitalis. (Image courtesy of AL Rhoton, Jr.)