642 



STRUCTURE OF THE CEREBRUM. 



[CH. XL VI. 



CHAPTER XLVI. 



STRUCTURE OF THE CEREBRUM. 



THE large size and complexity of the cerebrum distinguishes 

 the brain of man from that of the lower animals ; the amount of 



Fig. 476. View of the Corpus Callosum from above. J. The upper surface of the corpus 

 callosum has been fully exposed by separating the cerebral hemispheres and throwing 

 them to the side ; the gyrus fornicatus has been detached, and the transverse fibres of 

 the corpus callosum traced for some distance into the cerebral medullary substance. 

 i, the upper surface of the corpus callosum ; 2, median furrow or raphe ; 3, longitudinal 

 strife bounding the furrow ; 4, swelling formed by the transverse bands as they pass 

 into the cerebrum ; 5, anterior extremity or knee of the corpus callosum ; 6, posterior 

 extremity ; 7, anterior, and 8, posterior part of the mass of fibres proceeding from the 

 corpus callosum ; 9, margin of the swelling ; 10, anterior part of the convolution of the 

 corpus callosum; n, hem or band of union of this convolution; 12, internal con- 

 volutions of the parietal lobe ; 13, upper surface of the cerebellum. (Sappey, after 

 Foville.) 



convolution of its surface corresponds roughly with the degree of 

 intelligence. 



The cerebrum consists of two halves called cerebral hemispheres, 

 separated by a deep longitudinal fissure and connected by a large 



