1932] Poliak: Afferent Fiber Systems, Primate Cerebral Cortex 87 



Chapter XI 



LOCATION, EXTENT, AND FUNCTION OP THE AUDITORY 

 CORTEX 



1. BOUNDARIES OF THE AUDITORY PROJECTION OORTEX, CORTICAL 

 TERMINATIONS OF THE AUDITORY FIBERS 



The relation of the afferent auditory fibers to the cortex of the 

 hemisphere was determined in both of the present Experiments I and 

 II with a fair degree of exactness. Not considering the relation to 

 the claustrum (the possible branching of auditory fibers in that forma- 

 tion can naturally be ascertained only by Golgi's method), there can 



Fig. 10. A diagram showing the position of the auditory projection cortex in 

 the brain of the monkey as determined in the present investigation (small 

 deeply shaded area a below the Sylvian sulcus FS), and the posterior Sylvian pro- 

 jection area with as yet unknown significance (liglitly shaded area x on both sides 

 of the posterior extremity of the Sylvian sulcus). In reality both areas are 

 for the most part submerged in the fissures, small portions only appearing on 

 the free fac^ of the hemisphere. Thus the shaded areas in the figure show more 

 the location of these areas within the Sylvian fissure and their longitudinal extent. 

 Note the extensive region of the temporal lobe which does not receive any afferent 

 fibers. (Compare with figs. 7, 24.) 



be no doubt that only the superior temporal convolution in its upper 

 lip, corresponding with the lower or ventral horizontal wall of the 

 Sylvian fossa, receives fibers of the auditory radiation, while only a 

 few fibers reach the convex face of that convolution. (As to the nature 

 of afferent fibers entering the perpendicular internal wall of the 

 Sylvanian fossa and the posterior portion of the Sylvian sulcus it is 

 premature as yet to speak; see next paragraph.) Therefore, only that 



