1932] Poliuk: Afferent Fiber Systems, Primate Cerehral Cortex 91 



The fact that this new receptive area closely adjoins the actual auditory 

 area would argue for a close onto- and phylogenetic and also a func- 

 tional relationship to the eighth nerve. The same is suggested by the 

 probable origin of fibers which reach that temporo-parietal region 

 either from the internal geniculate body or from the ventral thalamic 

 region or even from the hypothalamus, which fibers form in reality the 

 caudal extension of the central auditory path. (Compare fig. 51 with 

 fig. 52.) The possibility that these fibers originate in the dorso- 

 lateral nucleus of the thalamus can almost certainly be excluded. 

 Perhaps the more oral portion of that region belongs indeed to the 

 cochlear projection cortex. The same can easily he true in respect to 

 its more caudal portion. This would give a plausible explanation to 

 the negative results of Schafer (1888) who observed auditory func- 

 tions unimpaired though the superior temporal convolution or even 

 the entire temporal lobe was removed; in his experiments with 

 monkeys this posterior Sylvian region remained undamaged. On the 

 other hand, the close vicinity of a portion of that cortex to the corpus 

 striatum makes us think that it may be somehow related to the 

 sense of equilibrium. In considering such a possibility I have refer- 

 ence to the opinion of Spiller (1906) and of Ariens Kappers (1921). 

 It would appear that the decision of this question can be reached by 

 physiological experiments. It should not be difficult to destroy sepa- 

 rately the cortex along both lips of the posterior extremity of the 

 fissura Sylvii including the posterior portion of the Sylvian fossa in 

 both hemispheres, and to examine what particular function is sub- 

 sequently lost. (See also Chapter XIII.) 



