1932] Poliak: Afferent Fiber Systems, Primate Cerebral Cortex 33 



of the claustrum (fig's. 44, 45), and beyond through the ventral portion 

 of the putamen and globus pallidus (figs. 46-49). Grazing in its 

 course the central portion of optic tract near the external geniculate 

 body (figs. 49, 50) and also the internal (medial) segment of the 



Fig. 2, Experiment II. External (upper figure) and internal (lower figure) 

 face of the monkey's hemisphere showing the location and extent of the three 

 projection regions of the cerebral cortex found in this experiment (shaded 

 areas). Somatic sensory region on both sides of the central sulcus (C) and 

 above the fornicate sulcus (Fc) ; auditory region, small deeply shaded area (a) 

 below the Sylvian sulcus (FS) and a projection region of unknown significance 

 along the posterior portion of the Sylvian sulcus, lightly shaded area (x) • visual 

 area in the upper lip of the horizontal branch of the ealcarine fissure (Foalc) and 

 in front of the ascending branch of that fissure. Differently shaded areas indi- 

 cate difference in number of afferent fibers. Small dotted area in the frontal 

 lobe represents the superficial lesion through which the knife was introduced 

 into the substance of the hemisphere. (Compare figs 44-62 and 65.) 



latter (fig. 51), it finally enters the internal capsule and the dien- 

 cephalon (figs. 48-51). Within the internal capsule, the lesion simu- 

 lates almost exactly the shape of this region, reaching upwards as 

 far as the tail of the caudate nucleus, without, however, damaging the 



