A new MRI technique plus theoretically flattening out all the brain's convoluted layers shows a 3-D grid layered out much as an electrican would wire a building or a computer, each layer at 90 degrees from the next:-http://www.newscientist.com/article/dn21647-human-brain-organised-like-a-3d-new-york-city-grid.html?cmpid=NLC|NSNS|2012-1004-GLOBAL|dn21647&utm_medium=NLC&utm_source=NSNS&utm_content=dn21647