156 STRUCTURE OF THE NERVOUS SYSTEM, BY MAX SCHULTZE. 



remarked by Pfliiger,* in the course of his investigations on the 

 nerves of the salivary glands, on which account he divided them 

 into two varieties. It is this kind of nerve fibre which, with 

 few exceptions, is present amongst the Invertebrata. Nerve 

 cords, which consist of such fibres, do not possess the bright 



Fig. 22. Medullated nerve fibres, a, from the olfactory nerve of the 

 Pike ; b, from the olfactory nerve of Man ; c, from the sympathetic 

 (splenic nerve) of the Ox ; d, from the nerve passing to the organ of 

 Jacobson in the Sheep. In this specimen are two medullated fibres. 



glancing appearance of ordinary nerves, but are semi-trans- 

 parent grey, gelatinous, and resemble embryonic tendinous 

 tissue. If they are freed from the denser connective tissue 

 which invests them, they can be broken up into their con- 

 stituent fibres as easily as other nerves, which is a consequence 



* Die Endigungen der Absonderungsnerven in den Speicheldrusen, 

 11 On the Mode of Termination of the Secretory Nerves in the Salivary 



Glands." Bonn., 1866, p. 31. 



