Example drawings of the apical (blue) and basal (red) dendritic arbors of human BA17 (top), BA20 (middle), and BA21 (bottom) pyramidal neurons. Axons, if present, are shown in green. On the right, the corresponding prevalence percentage of the different main apical branching patterns (top right): a) 0 bifurcations; b) 1 bifurcation; c) 2 bifurcations; d) 3 bifurcations—within the first 200 μm—is shown in each cortical region. Scale bar = 100 μm.