CHAPTER X 

 THE NERVOUS SYSTEM 



y 312. The Nervous System, the Master Organs. We are 

 now prepared to study a higher, a more wonderful and 

 complex agency, the nervous system, the master organs, 

 which control, regulate, and direct every other organ of 

 the human body. 



The nervous system is the medium through which all 

 impressions are received. It connects all the parts of the 

 body into an organism in which each acts in harmony with 

 every other part for the good of the whole. It animates 

 and governs all movements, voluntary or involuntary, 

 secretion, excretion, nutrition ; in fact, all the processes of 

 organic life are subject to its regulating power. 



313. The Nervous System brings us into Relation with 

 the World around us. In men and other highly organized 

 animals nerves are found in every organ of the body. They 

 come into contact with the most minute muscular fibers ; 

 they are closely connected with the cells of the glands and 

 are found in the coats of even the smallest^ blood vessels. 

 They are among the chief constituents of the sense organs, 

 including the skin. When we hear, our nerves of hearing 

 are bringing us into relation with the outer world. So sight 

 opens up to us another gateway of knowledge. 



In brief, the nervous system is the system of organs 

 through which we are brought into relation with the world 

 around us. 



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