314 



ELEMENTS OF PHYSIOLOGY 



OiSTUfiBANCES OF 

 ftOSE EAR. AND 

 OCCAYfD TTH 



SPINAL (MITA7IQH 



FIG. 2ii. The Situations of Headaches with 

 Relation to their Causes. 



Neuralgic headaches (not marked) are believed to 

 arise from congestion in the nerve centers. 



ing of pain in various places in the body where the nerves 

 terminate ; for " pain is the cry of a starved nerve for 



fresh blood or better 

 blood." The reason the 

 mind always refers the 

 pain to the end of the 

 nerve is that nearly all 

 .-MEWSES EXHAUSTION pain from a nerve does 

 come from some irrita- 

 tion at the end of the 

 nerve, and the mind re- 

 flexly, as it were, inter- 

 prets the pain as coming 

 from its usual source. 

 When the position is cor- 

 rected, the circulation is 

 freed and relieves the 

 nervous system. Downward displacement 

 of the abdominal organs may cause pressure 

 upon some of the sympathetic nerves and 

 ganglia and cause pain and derangement of 

 different organs. What causes the foot to 

 "go to sleep"? Can you explain the self- 

 deception in " Aristotle's experiment " (Fig. 

 212)? 



574. Effects of Alcohol on the Nervous Sys- 

 tem. As alcohol acts on many organs 

 through its action on the nervous system, 

 it would naturally be supposed that the nerv- 

 ous matter itself would be injured, and such 

 is the case. In fact, it is upon the delicate 

 nervous system that its most destructive ef- 

 fects are wrought. One of the first effects of 

 alcohol is a flushing of the face and a feeling 



& FIG. 212. Aristotle's 



of warmth on the surface of the body. This Experiment. 



