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Vniversitij of California Publications in Anatomy [Vol. 2 



at the same time oralward, reaching the thalamus from behind in order 

 to avoid the internal capsule and the corpus callosum (figs. 38, 37, 36, 

 35, 34, 33, 31, 30, 29, 28). By using a single cortical entrance and 

 directing the instrument according to carefully laid plans, the destruc- 

 tion of cortex and subcortical white substance of the parietal lobe 

 was minimized (see also chapters on the Visual and Auditory System). 



FcaLc 



Fig. 1, Experiment I. 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 below the Sylvian sulcus {FS); 

 visual area behind the simian sulcus {Ss) and along the calcarine fissure (Fcalc). 

 Differently shaded areas indicate rough differences in the number of afferent fibers. 

 The small" dotted area represents the supei-ficial lesion through which the knife was 

 introduced into the substance of the hemisphere. Superior occipital sulcus, external 

 calcarine sulcus (Sos). (Compare figs. 26-43.) 



This injury (L in corresponding figures) directly destroyed the 

 following parts of the thalamus : the pulvinar which is either destroyed 

 or greatly separated from the hemisphere (figs. 34-36), further a 



