THE NEURON 



51 



controversial questions, it may be regarded as generally accepted 

 that all of the preceding propositions have some measure of 

 factual basis, though different neurologists would give various 

 interpretations and modifications of some of them. 



The place where the axon of one neuron comes into physio- 

 logical relation with another neuron is known as the synapse. 



Fig. 15. Synapse between an ascending fiber entering the cortex 

 of the cerebellum and the dendrites of a Pur kin je cell. (After Ram6n y 

 Cajal.) 



Its precise nature is still obscure. Structurally it usually ex- 

 hibits a dense interlacing of the terminal arborization of an axon 

 of one neuron with the bushy dendrite of a second neuron. 

 In Fig. 1 (p. 25) such a synapse is seen between the dorsal root 

 neuron and the ventral root neuron. In other cases the ter- 

 minal arborization takes the form of a delicate network which 



