GUSTATORY ORGANS OF MAN AND MAMMALS. 



11 



The apices of these hairs appear scarcely to reach in the 

 normal state to the level of the gustatory pore. The inferior 

 (central) process is thin, cylindrical, and even at a small distance 

 from the nucleus is about three times more slender than the 

 above-described peripheric process. At a distance of O006 to 

 0'0012 of a millimeter from the nucleus it usually divides into 

 two but slightly thinner branches which extend to the surface 

 of the mucous membrane. Before this happens, however, 

 it divides once or several times in quick succession. The 

 chemical relations of the central process appear to be those of 

 a nerve fibril. 



Fig. 276. 



Fig. 276. a, Isolated gustatory cells, from the lateral organ of the 

 Rabbit, magnified 600 diameters ; b, an investing and two gustatory 

 cells, isolated but still in connection with one another, from the same, 

 magnified 600 diameters. 



Loven found that the gustatory cells of the Calf were somewhat 

 differently constructed. In these the peripheric outrunner is cylindrical 

 and rod-like, but supports no hair. The centric process is a long fine 

 thread, frequently beset with various enlargements and short branches 

 that are apparently abruptly broken off and are directed outwards. 

 In the case of Man, Loven found that the peripheric processes are 

 shorter and somewhat pointed at the extremity, though in other 

 respects they resemble those of the Calf. Schwalbe distinguished two 

 kinds of gustatory cells in Man and the Sheep pin or pe<j cells and 

 rod cells (Stiften-zellen and Stab-zellen). In the former, which are 

 the most common, the peripheric broader process is continuous at its 

 attenuated extremity "with a slender highly refracting style or point, 

 sharply truncated above." The point sometimes projects, in gustatory 

 bulbs isolated in perosmic acid, as much as 0'0072 of a millimeter 



