CHAPTER XLV1II 



STRUCTUKE OF THE CEREBRUM 



THE cerebrum consists of two halves, called cerebral hemispheres, 

 separated by a deep longitudinal fissure and connected by a large 



FIG. 423. View of the Corpus Callosum from above. J. The upper surface of the corpus cal 

 been fully exposed by separating the cerebral hemispheres and throwing them to the side ; 



losum has 

 the gyrus 



fornicatus has been detached, and the transverse fibres of the corpus callosum traced for some 

 distance into the cerebral medullary substance. 1, the upper surface of the corpus callosum ; 2, 

 median furrow or raphe ; 3, longitudinal striae bounding the furrow; 4, swelling formed by the 

 transverse bands as they pass into the cerebrum ; 5, anterior extremity or knee of the corpus cal- 

 losum ; 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; 11, hem or band of union of this convolution; 12, internal convolutions of the 

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



band of transverse commissural fibres known as the corpus callosum 

 (fig. 423). The interior of each hemisphere contains a cavity of com- 



