THE CORPUS CALLOSUM. 537 



As little is known or the function of the pineal and 

 Fig. 150.* 



* Fig. 150. View of the corpus callosum from above (from Sappey 

 after Foville). ^- 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 striae bounding the furrow ; 

 4, swelling formed by the transverse bands as they pass into the cere- 

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

 extremity ; 7, anterior, and 8, posterior part of the mass of fibres pro- 

 ceeding from the corpus callosum ; 9, margin of the swelling ; 10, ante- 

 rior part of the convolution of the corpus callosum ; 1 1, hem or band 

 of union of this convolution ; 12, internal convolutions of the parietal 

 lobe ; 13, upper surface of the cerebellum. 



