C. ESTABLE 



311 



orderly and systematic review of the neurohistological bases of neuro- 

 physiology, is to discriminate between the various types of contacts of a 

 neurone. The second requirement must be the functional elucidation of 

 such contacts. 



Fig. 2 

 Dendro-dendritic contact. Photo-micrograph of cerebellum of cat 

 showing a typical dendro-dendritic synapse (Dd. syn.) between 

 grains. Gr. = grains. (Golgi-Cajal method). 



Each neurone has two kinds oi contacts: (A) insulation and nutrition 

 (neuroglial) contacts; (B) transmission contacts probably having either 

 (i) one-way influence (dynamic polarization), or (2) mutual influence 

 (reversibility), including trophic effects in it, independent of the glio- 

 ueuronal ones. 



When the contact is neuroglial ov neuroschwannian, whether with 



