224 JOSEPH DUERSON STOUT 



ecto-Sylvian fissure. A third and less frequently found field is 

 situated under the region of the surface lying external to the 

 median portion of the supra-Sylvian fissure. The movements 

 obtained from stimulation within these fields were as function- 

 ally perfect as movements produced by stimulation of the motor 

 areas of the surface. They involved movements of each side 

 of the body and sometimes of both sides. 



From stimulation both of the corpus callosum and of the 

 corona radiata a large number of responses included a change in 

 the depth or rate of the respiratory movements. 



GENERAL SUMMARY 



Superficial motor cortex. 1. The general area of motor con- 

 trol in the cortex of the cat extends from the fissura coronalis, 

 on either side, to the mid-line, and about 5 cm. over the margin 

 of the mid-line on to that portion of the mesial surface of the 

 hemisphere back of the sulcus crucialis. It extends from a 

 point about 0.5 cm. above the upper margin of the olfactory 

 lobe backwards to the union of the posterior end of the fissura 

 coronalis with the anterior end of the fissura lateralis. It 

 extends well to the bottom of the sulcus crucialis on both banks. 



2. The area for control of the hind-limb and tail extends over 

 the posterior three-fourths of this area, being richest in the area 

 from the sulcus crucialis backwards. The area between the 

 ansate fissure and the median line is almost entirely for control 

 of the hind-limb. 



3. The area for motor control of the fore-limb includes that 

 between the inner end of the ansate fissure and the sulcus coro- 

 nalis, back of the sulcus crucialis, and the area immediately in 

 front of the sulcus crucialis extending downwards to the anterior 

 end of the fissura coronalis. 



4. The area for control of the neck lies anterior to the sulcus 

 crucialis and downward to a point about 0.5 cm. above the 

 upper margin of the olfactory lobe. 



5. The area for the control of the nose, mouth and tongue lies 

 around the superior end of the fissura supraorbitalis. Stimula- 



