CEREBRAL LOCALIZATION 58! 



From the internal capsule, the fibres pass in the crus cerebri to the 

 upper border of the pons Varolii. The motor fibres pass through the 

 pons as longitudinal fibres, go to the anterior pyramids of the bulb, 

 where most of them decussate, and thence to the pyramidal tracts of 

 the spinal cord. The sensory fibres go to the posterior part of the 

 cord. The converging cerebral fibres are reenforced, in their downward 

 course, by fibres from the tubercular quadrigemina and the gray matter 

 of the pons Varolii. Certain fibres go to the olivary bodies in the bulb. 



Fig. 143. Diagrammatic representation of the direction of some of the fibres in the cerebrum (Le Bon). 



A more extended description of these fibres will be given in connection 

 with the physiological anatomy of the bulb. As fibres pass through 

 parts containing nerve-cells, they often are "reenforced" in a way that 

 is- somewhat obscure. It is probable, however, that this is by fibres 

 originating in arborescent filaments (synapses) surrounding the cells. 



Cerebral Localization. The observations of Flourens (1822 and 

 1823) and his immediate followers, which seemed to show that the 

 cerebrum was neither excitable nor sensible to direct stimulation, have 

 been so completely contradicted by the experiments of Fritsch and 



