Right Hemisphere After Removal of the Frontoparietal Operculum. A, Right hemisphere after removal of the frontoparietal operculum, after removal of the insular rami of the middle cerebral artery. 1, Short sulcus of the insula; 2, precentral sulcus of the insula; 3, central sulcus of the insula; 4, postcentral sulcus of the insula; 5, apex of the insula; 6, limen insulae; 7, insular pole. B, Right insula after removing frontoparietal and temporal opercula, with an enlarged view, to see more clearly the convexity of the insula after removal of the M2 segment of the middle cerebral artery. 1, Anterior short insular gyrus; 2, middle short insular gyrus; 3, posterior short insular gyrus; 4, anterior long insular gyrus; 5, posterior long insular gyrus; *central sulcus of the insula; 6, apex of the insula; 7, limen insulae; 8, insular pole; 9, superior limiting sulcus of the insula; 10, inferior limiting sulcus of the insula; 11, anterior limiting sulcus of the insula. C, Inferolateral view of the right insula to show the basal and medial surfaces after removal of the fronto-orbital operculum and the posterolateral orbital lobule. 1, Anterior short insular gyrus; 1*, anterior surface of the anterior short gyrus of the insula; 2, middle short insular gyri; 3, posterior short insular gyrus; 4, anterior long insular gyrus; 5, posterior long insular gyrus; *central sulcus of the insula; 6, apex of the insula where the short gyri of the insula converge; 7, limen insulae; 8, insular pole, where the long gyri of the insula converge and end, and also the formation of the transverse and accessory gyrus takes place; 9, transverse gyrus of Eberstaller; 10, lateral accessory gyrus. D, Inferolateral view of the insulae, zoomed in. 1, Posteromedial orbital lobule; 2, anterior short gyrus of the insula; 2*, anterior surface of the anterior short gyrus of the insula; 3, lateral accessory gyrus; 4, transverse gyrus of Eberstaller; 5, apex of the insula, where the anterior short insular gyri converge; 6, insular pole, where the posterior long insular gyri converge and the accessory and transverse gyri are formed. (Images courtesy of E de Oliveira)