THE STRUCTURE AND FUNCTIONS OF NERVE-TISSUE. 25 



¥iG. 1. — Motor Nerve Cells connected by 

 intercellular processes (h, h), and giving 

 origin to outgoing fibres (c, c, c, and a) . 

 4. Multipolar cell containing much pig- 

 ment around nucleus. Diagrammatic. 

 (Vogt.) 



Fig. 2.— Multipolar Ganglion Cell from 

 anterior grey matter of Spinal Cord 

 of Ox. a, Axis cylinder process ; h, 

 branobed processes, magnified 150 dia- 

 meters. (Deiters.) 



connect the cells with one another, and also with distant 

 parts of the animal body. The function of the fibres is that 

 of conducting stimuli or impressions (represented by mole- 

 cular or invisible movements) to and from the nerve-cells, 

 while the function of the cells is that of originating those of 

 the impressions which are conducted by the fibres outwards. 

 Those of the impressions which are conducted by the fibres 

 inwards, or towards the cells, are originated by stimuli affecting 

 the nerve-fibre in any part of its length ; such stimuli may 

 be contact with other bodies or pressure arising tlierefrom 

 (mechanical stimuli), sudden elevations of temperature (ther- 

 mal stimuli), molecular changes in the nerve-substance pro- 



