192 



PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. 



On the whole, therefore, we must infer that the cortex in this 

 postrolandic area is concerned with the finer and more conscious 

 interpretations of the sensations of pressure, temperature, and 

 muscular conditions, and especially the higher type of these sensa- 

 tions which we can project or localize accurately. The definite 

 part of the cortex, if any, concerned in the primary conscious 

 mediation of the sense of pain and in the more general sensations 



Fissure of Rolando 



Internal or Median Fillet 



Fig. 84. Schema representing the origin and course of the fibers of the median fillet, the 

 intercentral paths of the fibers of body sense. 



of pressure and temperature that is, the so-called common or, to 

 use Head's term, protopathic sensations (p. 260) has not been 

 definitely localized. 



The Histological Evidence. Course of the " Fillet." On 

 the histological side there is very strong corroborative evidence for 

 the view that cortical centers for the sensory fibers of the body 

 in general lie in the parietal lobe in the region indicated above. 

 This evidence is connected with the path taken by the sensory 



