NERVE-CELLS 



471 



chromatolysis. When cells undergo degeneration and atrophy, the 

 chromatoplasm disappears. This process is called disuse atrophy. 



Fig. no. Cell from the electric lobe of the torpedo (Schultze). 

 a, axis-cylinder; 6, b, 6, dendrites. 



The Neuron. The prevailing idea now is that the nervous system 

 is made up of anatomically and physiologically distinct entities called 



