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University of California Puhlications in Anatomy [Vol. 2 



figs. 28 and 48). There might only linger as regards Experiment II 

 the possibility that the capsular lesion, indeed, interrupted all or 

 almost all fiber "fans" arising from the rostal portion of the thalamus. 

 Nevertheless, considering a wider extent of the frontal region receiv- 

 ing thalamic fibers and found to be concerned with sensation in the 

 experiments and studies of Monakow, Flechsig, Probst, Quensel, 

 Roussy, Sachs, Meier-Miiller, Tsunesuke Fukuda, I\Iinkowski, and 

 Dusser de Barenne (fig. 8), we must necessarily regard the anterior 



Fig. 8. Somatic sensory region in the monkey according to Dusser de 

 Barenne (1925). It occupies an extensive region both in front and behind the 

 central sulcus (C). Anteriorly it reaches the arcuate sulcus of the frontal lobe 

 (SA) and extends as far back as the superior temporal and the Sylvian sulci (FS). 

 Simian sulcus (Ss). 



limits of the somato-sensory region of the hemisphere as an unsettled 

 problem until it is shown where the fibers originating from the most 

 anterior segment of the lateral thalamic nucleus actually terminate. 



In any event, even granting that the actual boundaries of the 

 somato-sensory cortex lie farther from the central sulcus than is here 

 indicated, it is clear from the present investigation, that the somato- 

 sensory region of the hemisphere does not occupy merely a narrow 

 strip of cortex posterior to the sulcus centralis as accepted by nearly 

 all present day neurologists. It occupies in fact, a wide region includ- 

 ing the postcentral region, a considerable portion of the parietal 

 region, and almost the entire agranular precentral region. It surely 

 does include the entire electrically excitable or the so-called motor 



