View of the inferolateral surface of the brain showing the posterior cerebral artery. The temporal pole and operculum were dissected until the insula became partially exposed. This view discloses the vascular relationships with the uncus and with the cerebral peduncle along the crural cistern, and the relationships with the optic tract and with the anterior choroidal artery. 1, Basilar artery; 2, P1 segment; 3, posterior communicating artery; 4, anterior choroidal artery; 5, P2A segment; 6, P2P segment; 7, P3 segment; 8, posterolateral choroidal artery; 9, dentate gyri; 10, amygdala; 11, hippocampal head; 12, limen insulae; 13, medial cerebral artery; 14, insula; 15, pars triangularis; 16, pars opercularis; 17, posterior orbital gyrus; 18, gyrus rectus; 19, olfactory tract; 20, uncus. (Image courtesy of E de Oliveira)