1932] Poliak: A-fferent Fiber Systems, Primate Cerebral Cortex 43 



Fibers destined for the most dorsal segment of the sulcus centralis and 

 for its vicinity corresponding with the centers for the lower limbs 

 and for the anosacral region have an almost direct ascending course 

 (4 in fig. 5) ; those for the subsequent lower segments of the central 



FcaCc 



Fig. 4, Experiment V-A. External (upper figure) and internal (lower figure) 

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

 shape of the two projection regions of the cerebral cortex found in this experi- 

 ment (shaded areas). Somatic sensory region on both sides of the central 

 sulcus (C) and above the cingular sulcus (Sc) ; visual area (area striata) over 

 the occipital lobe (upper figure), and along the calcarine fissure (Fcalc in the 

 lov^^er figure). The portion of the visual area shaded with continuous and 

 broken horizontal lines represents the macular cortex where degenerated afferent 

 fibers enter, in present experiment; the dotted portion of the visual cortex over 

 the occipital lobe and over the inner face of the hemisphere along the calcarine 

 fissure remained with normal fibers. Small dotted area in the posterior part 

 of the temporal lobe indicates the point of entry of the instrument. 



sulcus corresponding with the centers of the thorax, of the upper 

 limbs, of the face, and so forth, are at first slightly bent and then 

 describe even sharp curves (3, 2, and 1 in fig. 5) . The thalamo-cortical 



