The 3D space (Reference System)

(ICL: intercommissural line, VAC: vertical through the center of the anterior commissure)

• every section is adjusted into a defined spatial coordinate system.
• the atlas uses the reference system of Talairach with the modifications that
  
  • (a) the intercommissural line (ICL) passes through the center of the anterior and posterior commissure
  • (b) the point zero (= point 0/0/0) for all three dimensions is the center of the anterior commissure.
• the morphologic data of the hemispheres are handled as coordinate points in this
  3-D (metric) grid as X- (mediolateral), Y- (vertical), and Z-coordinates (fronto-occipital).