BRAIN FACIAL PARALYSIS. 109 



interferes with corresponding movements; hence, 

 when we find one particular set of movements 

 interfered with, we infer the seat of lesion. 



Similarly, convulsion or spasm in one particular 

 set of muscles indicates the discharge of motor force 

 from the particular set of nerve-centres whose 

 destruction leads to paralysis of that particular 



Fig. 11. Left Hemiplegia, with cerebral palsy, left side. 



set of muscles. The irritation causing such a 

 discharge of force may be a tumour, or local in- 

 flammation irritating that portion of brain. Hence 

 coarse or extensive paralyses, and other profound 

 disturbances of the nerve-muscular system, have 

 received much attention ., from clinical and patholo- 

 gical observers, and by the accumulation of their 

 joint observations much knowledge has been gained 



