DBUG8 ACTING ON THE NEETOUS SYSTEM 43 



Uses. — Drugs depressing the motor cells of the cord are 

 serviceable as antidotes in the treatment of poisoning by 

 those exciting the same (chloral and bromides in strychnine 

 poisoning), and in convulsive and spasmodic disorders, as 

 chorea and tetanus. 



III. — Drugs Acting on the Nerves. 



The nerve terminations, rather than their trunks, are 

 influenced by drugs. 



(A) Drtcgs influencing peripheral sensory nerve-endings, 



(1) Stimulating sensory nerve - terminations. — Counter- 

 irritants. (See p. 62.) 



General Uses. — They are applied externally (mustard 

 and heat) to stimulate the heart and respiration in heart 

 failure, shock and collapse. 



(2) Depressing sensory nerve-terminations. — These include 

 local sedatives or anodynes, which lessen sensation ; and 

 local anaesthetics, which abolish sensation. 



LOCAL ANODYNES 



Aconite Morphine Veratrine 



Menthol Chloral Heat 



Carbolic acid Prussia acid Cold 



Atropine Sodium bicarbonate 



LOCAL ANESTHETICS 



Cocaine HolocaJne ^nrair i Methyl-chloride 



Eucaine Cold ^^^^^ ( Ether 



Uses. — The local anodynes are employed to relieve pain 



of an inflammatory, rheumatic or neuralgic character, and 



itching. The local anaesthetics are employed to prevent 



pain in surgical operations. 



(fi)^ Drugs influencing peripheral motor nerve-endings. 



(1) STIMULATING MOTOR NEBVE-TBEMINATIONS 



Strychnine Aconite Pyridine 



Pilocarpine Nicotine 



(3) DEPRESSING MOTOR NERVE-TERMINATIONS 



Curare Atropine Pruasic acid 



Conium Cocaine Nicotine 



Amyl-nitrite Ciiin]ihor n i i d many others 



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