Anatomical/physiological relations. A, dorsoventral versus mediolateral dendritic range. B, correlation of mediolateral asymmetry, as shown by plot of mediolateral position of excitatory input zone relative to soma (weighted mean) versus the difference between the medial and lateral dendritic range. The correlation is significant for the lamina I neurons (r= 0.59, P < 0.01). A weaker but significant correlation is also found if one uses the mediolateral weighted mean of the dendritic distribution instead of the mediolateral difference (r= 0.45, P < 0.05). C, dorsoventral position of the inhibitory synaptic input zone (weighted mean) relative to the soma versus dorsoventral weighted mean of the dendritic distribution. A significant correlation is shown by the lamina I neurons (r= 0.68, P < 0.05) and the lamina I–II border neurons (r= 0.68, P < 0.05), but not the lamina II neurons.