ant. middle isthmus splenium b third third

Figure 3.3. (a) Mean CC subarea measures for women (white bars) and men (black bars). (b) Mean CC ratios (CC subarea divided by FBV) for women (white bars) and men (black bars). Vertical lines indicate standard deviations.

difference was restricted to the middle third and the splenium. However, because this quintile comprised 5 female and 19 male brains, a sampling error is possible.

In our opinion these data suggest that brain volume is the main factor affecting relative callosal size. Because the CC/brain size relationship follows a geometric rule, larger brains will be associated with smaller CC ratios than smaller brains. Since on average women have smaller brains, they will have larger CC ratios. More important, women with large brains do show small CC ratios, while men with small brains show large CC ratios. Thus, the size of the CC and the CC ratio depend mainly on brain size and not on gender per se.

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