Plats II.-PERIPHERAL ORGANS AND COMPOUND NERVE 



TRUNKS. 

 Fig. I. 



Diagram of three papiU^ from the frog's tongue, to show the arrangement o. the 



nerve fibres. Each papiUa is connected with its neighbours by fibres, as well as 



with the nervous centre. Amongst these are, 1 , aflerent fibres ; 2. efferent fibres ; 



3, commissuaj peripheral fibres ; and 4, commissaal central fibres. 



Fig. 2. 



centre. 



Central and peripheral portion of spinal nervous system. =l^°^°p"^^^i'r^,j°?-,.°! 



dark-bordered fibrs into a large number of fibres as it approaches both centre 



and periphery. See also PI. III. ng. 1. p. 187. 



Pig. 3. 



Fig. 4. 



/tu 



The course and division of individual 

 dark-bordered nerve fibres show^mg 

 tbat one of the fibres resulting from 

 tbQ sub-division of a fibre passes on 

 in the direction of th^ original fibre, 

 ■rcbile the other passes into the branch 

 ■which diverges from the trunk. 



A nerve dividinj^ into three branches. 

 From the breast muscle of the frog. 

 At a and b individual dark-bordered 

 fibres are seen to divide, the fibres 

 resulting from the sob-division pass- 

 ing on^^ards in different branches. 

 Copied from an actual specimen. 



