There are connections between all the cortical layers. See the description of cortical columns: http://brain.oxfordjournals.org/content/brain/120/4/701.full.pdf

There are connections between all the cortical layers. See the description of cortical columns: http://brain.oxfordjournals.org/content/brain/120/4/701.full.pdf http://brain.oxfordjournals.org/content/brain/120/4/701.full...