PROSENCEPHALON OF MAMMALS. 



139 



of which many bend downward and outward, suggesting the term 

 * fibrous ' or * radiated ' cone ; in Man they are traceable chiefly 

 in the sylvian, postsylvian, entosylvian, supersylvian,medilateral, 

 medial, and marginal folds, and into the major part of those of the 

 anterior lobe, fig. 122, a. The tegmental or posterior fibres are, 

 in Man, more directly connected with the transversely arched 



122 



Dissection of cerebrum and cerebellum, from the outer side, xxxi 



fibres of the great commissure : others, diverging to the posterior 

 lobes, e, b, become connected or continuous with the longitudinal 

 commissural system of the fornix. Figure 123 is a dissection of the 

 inner surface of the hemisphere, c is the section of the corpus 

 callosum, the fibres of which diverge upon the roof of the ventricle, 

 intersecting the radiating fibres, fig. 122, s, and passing into all 

 the folds, which are thus brought into communication with those 

 of the opposite hemisphere. The fibres of the ' callosal ' fold, 

 fig. 123, o, o, are chiefly longitudinal, are continued behind, into 

 those of the hippocampus, and in front into those extending from 

 the fornix upon the falcial surface of the anterior lobe : externally 



