MOTOR IMPRESSIONS 171 



ments not being represented in the pictured movement 

 area. So much for some of the facts ; what is the probable 

 interpretation of them ? 



It is obvious that in birds, and vertebrates lower than 

 birds, there is a co-ordinating mechanism in the spinal 

 cord a reflex mechanism which is capable of carrying 

 on the movements of the body in the entire absence of 

 the brain ; that the brain is not necessary for the working 

 of this reflex mechanism. In the rabbit and dog this 

 reflex mechanism of the cord is considerably lessened, 

 and the centre for the initiation of movement is in the 

 brain; but it is obviously not (in its essential part) in the 

 cortical pictured movement area. As a matter of fact, 

 experimental evidence has proved it to be in a ganglionic 

 mass connected with the cortical neopallium which is 

 named the corpus striatum (for details see the work of 

 Kinnier Wilson and others). 



In a Monkey, although some movement is, without 

 doubt, still initiated from the corpus striatum, much 

 (and quite a definite part) is now lodged in the cortical 

 pictured movement area. 



In Man all the pictured movements are initiated from 

 this area, but movements of which the individual has no 

 definite pictured cognizance such as the movements of 

 the heart and viscera, and the movements of respiration 

 are still lodged in the ganglionic masses of the brain 

 stem. 



It would seem probable that the representation of the 

 pictured movements are arranged in the neopallial cortex 

 in a perfectly definite order, and that the sequence of their 

 establishment is evidenced by the well-known distribution 

 of the areas in the kinsesthetic region of the human brain 

 (see Fig. 71, p. 192). It is perhaps not beyond possibility 

 that the full lodgment of all pictured movements is not 

 yet permanently effected in all human brains, and that 

 the process is still in progress. There is certain anatomical 

 support for such a supposition, but its exact nature does 



