404 



ELECTRO-PHYSIOLOGY 



CHAP. 



straight muscle to the belly, running in the loose connective 

 tissue between muscles and integument, in company with the 

 artery and vein, along the side-line towards the posterior border of 

 the organ. Branches are given off repeatedly on either side, 



FIG. 263. Rind of Mulu^/i TCC/IV, from the inner aspect, showing the two electrical ' 

 nerves (ne), and their immediate ramifications. (Fritsch.) 



which, after running a short distance and dividing once or twice, 

 pierce suddenly through the inner tendinous integument of the 

 organ (Fig. 263). 



The electrical nerve is of considerable diameter at the middle 

 of its course, this being the more remarkable since as Bilharz first 

 pointed out it is a single, giant, medullated primitive fibre, which 



