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University of California Puhlications in Anatomy [Vol. 



that is, receptive and motor areas), receive afferent fibers from sub- 

 cortical nuclei (though they grant that the fibers reaching the various 

 regions may vary somewhat, for example in number). In such a view 

 the distinction between the true projection areas and regions and the 

 intercalated association areas and regions would almost or even wholly 



Fig. 24. A diagram summarizing the results of the present experiments on 

 the location and the extent of the three projection areas or regions of the 

 cerebral cortex in the monkey (shaded areas). Upper figure shows the lateral 

 face, the lower figure the medial face of the hemisphere. Sulcus centralis (C) 

 with the somatic sensory region in front and behind it. Sylvian fissure (FS) 

 with the auditory region (small deeply shaded area a) and the projection area of 

 unknown significance along the posterior extremity of that fissure (larger lightly 

 shaded area re). Operculum oceipitale (Oo) behind the sulcus simialis showing 

 the extent of the visual projection area over the external face of the occipital lobe. 

 Fissura calcarina (Fc), where the visual projection cortex remains hidden along 

 its horizontal undivided branch. Sulcus cinguli (Sc), sulcus occipitalis superior 

 or sulcus calcai-inus externus of Cunningham- Smith (Sos). (Compare with fig. 7.) 



disappear. On the contrary, the present investigation points to a 

 division of the cerebral cortex into receptor fields and intercalated or 

 association areas or regions, approaching in this respect the conception 



