y velumFrenulumInferior medullary velumTaeniaFastigiumFloorUpperFacial colliculusLocus coeruleusLowerVagal trigoneHypoglossal trigoneArea postremaObexMedial eminenceSulcus limitansAperturesMedian/MagendieLateral recess to Lateral/LuschkaOtherRhomboid fossaTela choroideaCerebrospinal fluidBlood–brain barrierCerebral aqueductInterventricular foraminaPerilymphatic ductRelatedVentriculomegalyvteCommissural fibers in the human brainCorpus callosumGenuSpleniumTapetumRostrumArchicortexIndusium griseumLamina terminalisVascular organ of lamina terminalisAnterior commissureFornixFornixSeptum pellucidumSeptal nucleiMedial septal nucleusSubfornical organCave of septum pellucidumOtherPosterior commissurevteThe cranial nervesTerminal (CN 0)Nucleiseptal nucleiCourseno significant branchesOlfactory (CN I)Nucleianterior olfactory nucleusCourseolfactory bulbolfactory tractOptic (CN II)Nucleilateral geniculate nucleusCourseoptic chiasmopti