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## Chapter 18, Figure 6

(A) Numbers of neurons in each of 35 cytoarchitectonic areas (Von Economo classification). These data were corrected for shrinkage due to the methods of tissue preparation used by Conel as well as for stereological error (see text in chapter 18 for details). They are based on measurements taken from the left hemisphere. The number of neurons in each cytoarchitectonic area was computed by multiplying the age-specific values of its cortical surface area by its number of neurons per 1 mm2 column. The much greater spread of these data compared to those of figure 5 are partly due to cytoarchitectonic differences in their cortical surface areas. (B) Same data as in panel (A) but the values of each cytoarchitectonic area are normalized by their birth value. The largest postnatal increase in cortical neuron number for all areas is 350% of the birth value for area FDFMa (BA 46). All cortical areas show a postnatal increase in neuron number.

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