372 



ANATOMY FOR NURSES [Chap. XIX 



(2) whether this impulse excites or inhibits ; and (3) the kind of 

 action excited or inhibited, which in turn depends upon the kind 

 of tissue in which the fibres end. 



Eflferent 



Excitatory- 



Inhibitory 



Motor 



Secretory 



Inhibito-motor 

 Inhibito-secre- < 

 tory 



Motor. 

 Vasomotor. 

 Cardiomotor. 

 Visceromotor. 

 Pilomotor. 

 Salivary. 

 Gastric. 

 I Pancreatic. 

 I Sweat. 

 Subdivisions corresponding to the 



varieties of motor fibres above. 

 Subdivisions corresponding to 



the varieties of secretory fibres 



above. 



Afferent < 



Excitatory 



Sensory 



Inhibitory 



Reflex 



Inhibito-reflex 



Visual. 



Auditor}'. 



Olfactory. 



Gustatory. 



Pressure. 



Temperature. 



Pain. 



Hunger. 

 . Thirst, etc. 



I According to the efferent fibres 

 I affected. 



Inhibitory effects upon the con- 

 scious sensations are not de- 

 monstrated. 



The reflex fibres that cause un- 

 conscious reflexes are known to 

 be inhibited in some cases at 

 least. 



Identity of nerve-impulses. — The generally accepted belief 

 is that nerve-impulses are identical in character and vary only in 

 intensity. According to this the impulses carried by a sensory 

 nerve are similar in character to those carried by a motor nerve, 

 and yet the result is different. The result is thought to be deter- 

 mined by the nature of the tissue in which a nerve-fibre ends, 

 rather than by the nature of the fibre itself. 



