96 



NERVOUS SYSTEM. 

 FIG. 25. 



Nerve-cells, from Spinal and Sympathetic Ganglia of Man, enclosed in their Capsular 

 Sheaths from hardened preparations (Key and Retzius). 



The former are those by which impressions are taken from the 

 periphery to the brain, and are commonly called sensory fibres. 

 The latter conduct the stimuli to the periphery, and are known 

 as motor fibres. Besides these, some of the fibres serve to connect 

 ganglia of the central system one with another, and these are 

 known as intercentral fibres. 



What modifications of function belong to the afferent nerves ? 



The direct function of the centripetal nerves is the conduction 

 of an impulse which gives rise to a sensation, as of pain or heat ; 

 but beyond this we may have a reflex or an inhibitory impulse 

 conducted. 



What modifications of function belong to the efferent nerves? 

 The centrifugal nerve-fibres may carry other than motor im 



