View of the basal surface of the brain. The parahippocampal and lingual gyri were dissected to expose the posterior cerebral artery and its main branches. This specimen characterizes a temporal group 1. 1, P1 segment; 2, posterior communicating artery; 3, P2A segment; 4, trochlear nerve; 5, anterior temporal artery; 6, P2P segment; 7, P3 segment; 8, P4 segment; 9, medial temporal artery; 10, posterior temporal artery; 11, rhinal sulcus; 12, parahippocampal gyrus. (Image courtesy of E de Oliveira)