54 



Precentral or Motor Area 



[CHAP. 



FIG. 4. Amputations. 



Composite diagram to show the distribution of the giant cell changes in the six cases of amputation submitted to 

 examination. 



The numbers 2 and 3 are placed in connection with the area on the mesial surface and margin of the hemisphere, 

 which suffered in two instances of amputation of the leg below the knee (cases 2 and 3). The number 1 

 points to the additional field which suffered when the amputation was through the knee joint and the thigh 

 muscles were thrown out of action (case 1). We presume that the rich area below this controls hip muscles. 



A is placed opposite the great annectaut gyrus or buttress, invariably barren as regards giant cells. 



The bracket 2a shows the extent of the affected field in case 2 (arm), amputation through upper arm with great 

 wasting of shoulder muscles ; la, amputation at same level but no shoulder atrophy (case 1) ; 3d, amputation of 

 hand (case 3). 



The black circles roughly indicate the position of the groups of cells referred to in the text. 



