48 



University of California Publications in Anatomy [Voi>. 2 



In Experiment II the somatic sensory cortex extends, however, 

 farther orally over a greater part of area 6 of Brodmann and includes 

 a portion of that area buried within the arcuate sulcus. This, as 

 is easily understood, is due to the greater extent of the injury oral- 

 ward in Experiment II. In Experiment III, on the contrary, by the 



Fig. 6. A diagram showing the extension and boundaries of the "minimal" 

 somatic sensory projection cortex in the brain of the monkey as determined in 

 the present investigation. Upper figure represents the lateral face of the hemi- 

 sphere. Here the somatic sensory region extends rather more in front of the 

 sulcus centralis (C) than behind it. Differently shaded areas indicate difference 

 in number of afferent fibers. The "nuclear or focal zone" of the entire 

 somatic sensory region, that is, the zone receiving the greatest number of 

 afferent fibers, is indicated by a narrow, deeply shaded area on both sides of 

 the central sulcus. This area is in reality completely submerged in the central 

 furrow. (Compare with figs. 9, 48, 60.) Lightly shaded areas are those receiv- 

 ing a correspondingly smaller number of afferent fibers. Lower figure shows 

 the extent of the somatic sensory projection cortex on the internal face of the 

 hemisphere. Sylvian sulcus (FS), cingular sulcus (Sc). 



accidental location of the injury, only caudal segments or "fans" of 

 the thalamo-cortical radiation destined to supply the postcentral half 

 of the entire somatic sensory region were interrupted. Thus in all 



