NERVE-CELLS. 



71 



Axis-cylinder Process. Every nerve-cell has an axis-cylinder 

 process, which, in the medullated nerve-fiber, becomes the axis- 

 cylinder, and in the non-medullated is the nerve-fiber itself. This 



. Dendrite. 



v - Nucleus. 

 ' x Nucleolus. 

 ' Cell-body. 



Neuraxis. 



FIG. 76. A ganglion-cell from anterior horn of the spinal cord of calf; teased 

 preparation ; X 140 ; by this method only the coarsest ramifications of the dendrites 

 are preserved ; the rest are torn off (Bohm and Davidoff ). 



process is characterized by the fact that it gives off a few 

 side-shoots, collaterals in its course ; thus its branching is very 

 limited. To this process some histologists apply the term neuron, 



Dendrite. 



Neuraxis. 



-Neuraxis. 



Dendrite. 



FIG. 77. Motor neurones from the anterior horn of the spinal cord of a newborn 

 cat ; chrome-silver method (Huber). 



while others call it neuraxon, or axon, and reserve the term 

 "neuron" for the whole nerve-unit that is, the cell and all its 

 processes, for which the term neurone is more commonly used. 



