204 THE SURGICAL PHYSIOLOGY 



greatly increased ; the impulses leading to this 

 increase perhaps descend on the other side of the 

 cord. There will be, therefore, rigidity of the left 

 leg and exaggerated reflexes. 



(iii). The cerebellar tracts and posterior columns of 

 the left side, causing loss of muscle and joint sense, 

 and loss of tactile discrimination and recognition of 

 objects on the left side. 



(iv). The spinothalamic tract, by which heat, cold, 

 and pain travel up from the right leg, will also be 

 pressed upon. 



Tactile sense may not be lost in either leg, as a 

 double path, the one crossed and the other uncrossed, 

 is open to it. 



Table to Illustrate the Effects of a Tumour 

 OF the Left Lower Cervical Region. 



3. It may arise in the central grey matter. In this 

 case there will be loss of the heat, cold, and pain 

 senses on both sides, but tactile and muscular sense 

 will remain. There may be some spastic paralysis 



