Obwongo bulimu ebitundu ebikulu bisatu; Mulowooza (cerebrum), Mukwanaganya (cerebellum) n’Omutunsi gw’obwongo (brain stem) oguliko medulla wabulongota n’emiraatira gy’obusimu. Mulowooza ate era n’agabanyizibwaamu ebiwayi (kemisifiiya) ebifuga ebikolwa ebigereke mu mubiri.