Figure 2.

The first 2.5 postnatal months represent a period of rapid increase in complexity (ie, branching) of oblique dendrites in the dorsolateral prefrontal cortex (Brodmann area 9). This conclusion is based on the comparison of oblique dendrites between a newborn (A) and a 2.5-month-old infant (B). The dendritic tree has reached adult morphology by 2.5 years of age (C) and it does not differ qualitatively from the dendritic tree seen in adults (D); (scale bar = 25 μm.)