438 THE SALIVARY GLANDS, BY E. F. W. PFLUGER. 



the latter case it runs between this and the fibrillar processes 

 of the columnar epithelial cells. 



When we consider the incredibly large supply of nervous 

 fibrils that lies beneath the membrana propria, the question of 

 the object of this abundance naturally suggests itself. After 

 studying with greater exactitude the laws of the growth of 

 glandular epithelium, we shall find that a completely satisfac- 

 tory solution of this question may be attained. I shall treat of 

 this point, however, at a later period. I would only mention 

 here that numerous young salivary cells develop from every 

 columnar cell, with its fibrillar processes, and that each of these 

 must again have its proper nerves. This is true also in the 

 case of the adult animal. From the almost imperceptibly fine 

 fibrils of the columnar cells the fibres of the epithelium cells of 

 the alveoli proceed, which we shall now subject to a careful 

 consideration. 



Two kinds of nerve termination are to be distinguished in 

 the alveoli : 



I. The most important is that of the medullated primitive 



Fig. 83. 



Fig. 83. From the Ox. An alveolus with the terminations of 

 medullated nerves which have been blackened by perosmic acid. 

 Magnified 590 diameters. 



fibres. These branch very frequently between the alveoli, apply 

 themselves to the membrana propria, and usually give off at the 

 point where they penetrate it several branches, which run for 



