<prompt> Not true regarding optic chiasma:Lies over tuberculumTumor over chiasma can lead to visual field defectsDecussation of visual pathway takes place over chiasmaInferonasal fibres are related to posterior poion of chiasma  <response>: Inferonasal fibres are related to anterior poion of chiasma. Optic Chiasma Lies over tuberculum. Tumor over chiasma can lead to visual field defects. Decussation of visual pathway takes place over chiasma for nasal fibres from retina. Inferonasal fibres are related to anterior poion of chiasma whereas superonasal fibres are related to posterior poion of chiasma. 