Coronal section of the human prefrontal cortex indicating location of two regions where oligodendrocyte density and soma size were measured. A larger contour was placed in the deep part of the ventral prefrontal white matter, while a smaller contour was placed inside the gyral ventral prefrontal white matter underlying Brodmann area 47. Numbers refer to Brodmann areas.
Abbreviations: cc, corpus callosum; d, dorsal; v, ventral.