GROWTH OF THE CEREBRAL CORTEX 



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0.1 02 0.5 04 05 Q<) 07 



09 10 11 12 13 H 15 Ifc 1.7 18 19 20 



Chart 8 Giving the average thickness of the cerebral cortex for each brain 

 weight group at localities IX, X, XI, XII and XIII in horizontal section and the 

 average thickness for each brain weight group in horizontal section for the five 

 localities combined. Based on table 8. ■ — • — (above the heavy line) Cortical 

 thickness at locality IX. Corrested. • — • — » (above the heavy line) Cortical 



thickness at locality X. Corrected. Cortical thickness at locality XI. 



Corrected. • — • — • — (below the heavy line) Cortical thickness at locality 



XII. Corrected. (below the heavy line) Cortical thickness at locality 



XIII. Corrected. • •!! Average thickness of the cortex in the horizontal 



section for each brain weight group. Corrected. 



general average thickness of the cortex in any brain weight group 

 was obtained by adding the three averages for each brain weight 

 group and dividing the sum by three. The averages of the brain 

 weights were copied from tables 6 and 7 for the sagittal and 

 frontal sections and from table 8 for the horizontal sections. The 

 general average brain weight is obtained by adding the values in 

 table 6 and in table 7 to the value in table 8 and dividing the 

 sum by three. 



