THE CORTEX AND MEDULLARY CENTER OF THE CEREBRAL HEMISPHERE 301 



surface of the hemisphere (Fig. 228). It sweeps over the insula, occupying the 

 base of the frontal and parietal opercula, and then bends downward into the 

 temporal lobe (Fig. 174). It is composed for the most part of bundles of rather 

 short fibers which radiate from it to the frontal, parietal, occipital, and temporal 

 cortex. 



The superior occipitofrontal fasciculus runs in an arched course close to the 

 dorsal border of the caudate nucleus and just beneath the corpus callosum. It 

 is separated from the superior longitudinal fasciculus by the corona radiata 

 (Fig. 229). 



The weight of the brain varies with the sex, age, and size of the individual. 

 The average weight of the brain in young adult men of medium stature is 

 1360 grams. It is less in women and in persons of small size or advanced age. 

 It is doubtful if there is any close correlation between the brain weight and 

 intelligence or between the latter and the size and arrangement of the cerebral 

 convolutions (Donaldson, 1898). 



