1932] Poliak: Ajfereni Fiber Systems, Primate Cerebral Cortex 255 



Fig. 50, Experiment II. The lesion (L), most extensive in this series, occupies 

 almost the entire internal capsule besides desti'oying the globus pallidus and a 

 portion of the optic tract (II), and penetrates into the ventral portion of the 

 thalamus (Tli) and into the hypothalamus. Within the lateral nucleus of the 

 thalamus many degenerated ascending fiber bundles are visible (tenninal branches 

 of the median fillet and so forth). The thalamo-cortieal radiation (sr), forming 

 in reality a thick fiber sheet, ascends toward the superior parietal convolution 

 (PS), which is the caudal continuation of the postcentral gj'rus. Few degenerated 

 fibers are visible in the cingulum, others in the inferior parietal convolution (PI). 

 The auditory radiation (ar) is here already rich in fibers, all of them entering the 

 upper lip of the superior temporal convolution (T,), especially into an elevation of 

 the cortex in the Sylvian fossa (FS) which might be compared with the transverse 

 temporal convolution of Heschl in the human brain (Ttr). Some thin bundles 

 ascend from the region of the putamen and enter the cortex around the dorsal 

 corner of the Sylvian fossa. 



