THE NEOPALLIUM. 



343 



have been traced to endings in the motor sphere of the cortex. 

 (4) Fibers of projection. These arise from the pyramidal cells 

 and descend through the white matter to form constituent fibers 

 of the internal capsule of the corpus striatum and end in various 

 lower centers of the brain or spinal cord. They are therefore 

 efferent fibers which carry impulses from the cortex and bring 

 other parts of the nervous system under its influence. 



Functional areas of the neopallium.— The archipalHum, 

 as described in the last chapter, is devoted to olfactory and possibly 

 gustatory functions. The neopalHum is concerned with visual, 



Fig. 174. — Scheme of commissural and projection'^ fibers of the cortex. From 

 Cajal (Nouvelles idees, etc.). A, corpus callosum;|S, anterior commissure; C, 

 pyramidal tract. 



auditory and general bodily sensations, with voluntary actions 

 and with all the complex associational processes involved in our 

 more highly organized activities, and in the formation and expres- 

 sion of ideas. But the whole of this large cortical area is not de- 

 ■voted indifferently to these several functions. It is shown by several 

 independent methods of investigation that there exists in the 

 neopallium a division of labor which is expressed by the term 

 cerebral localization of functions. Thus, in case of any disease 

 or injury which produces a lesion of a part of the cerebral cortex, 

 one or more bodily functions may be interfered with and the study 



