MOTOR IMPRESSIONS 165 



ments of the hand are increasing in perfection. These 

 things we are picturing as demanding pallial representa- 

 tion, and it is likely that the hand-tactile area will be 

 added as a new neopallial area beyond that devoted to 

 snout touch, and that its corresponding motor area will 

 be attracted to it as a distal addition to the snout move- 

 ment area. This, again, is a condition which passes from 



FIG. 64. FIG. 65. 



FIG. 64. CEREBRAL HEMISPHERE OP Macroscelides (THE JUMP- 

 ING SHREW), TO SHOW THE CORTICAL AREAS AS DETERMINED 

 BT PROFESSOR ELLIOT SMITH. (FROM DUCKWORTH.) 



M, Motor. S, Sensory. V, visual. A, auditory areas. The 

 white areas are olfactory. 



FIG. 65. CEREBRAL HEMISPHERE OF Tupaia (THE TREE SHREW), 



TO SHOW THE CORTICAL AREAS AS DETERMINED BT PRO- 

 FESSOR ELLIOT SMITH. (FROM DUCKWORTH.) 

 Note the development of a prefrontal area in front of the motor 

 cortex (M). 



the hypothetical to the actual, for the sensory and motor 

 association areas of the hand are laid down on the un- 

 folding neopallium as outliers to those we have already 

 seen to be realities. 



For the present we will leave brain architecture at 

 this point where neopallial representation is comprised, 

 in our limited survey, to taste and tongue movement 

 areas; snout tactile and snout movement areas; hand 

 tactile and hand movement areas, as localized portions 

 of cortex spreading from the old archepallial olfactory 

 area over the unfolding neopallium. Meanwhile we will 



