EXTRACT XXXIII. A. 



ON THE DISTINCTNESS, AND RELATIONSHIPS, OF 

 THE TWO NERVOUS SYSTEMS IN STRUCTURE, 

 AND FUNCTION. 



THAT the systemic nervous system, in whole, and in 

 part, is anatomically, and histologically, distinct from, 

 its surrounding, or, so-called, non-nervous, or sympa- 

 thetically innervated, related textures, is true, must be 

 accepted partially only, or to the extent that complete 

 insulation, or distinctness, characterises only the parietal 

 relationships of the completely developed textures, 

 nervous, and non-nervous, thus leaving the neuronal, 

 or nerve cell, dendritic processes, and the nerve terminal 

 processes, or extensions, or the proximal, and distal, 

 extremities, respectively, of the systemic nervous system, 

 to commingle with, and merge in, its non-nervous, or 

 sympathetically related, textures. Into this inner, and 

 non-related, or distinct, anatomical nerve area, we con- 

 tend, therefore, that, owing to this lateral insulation of 

 the axonal fibres, no substance can enter, save by these 

 proximal, or dendritic, processes, and that no substance 

 can be exuded, or excreted, save at axonal process inter- 

 ruptions, and by the distal, or peripheral, nerve terminals, 

 sensory, and motor ; from which it follows that all sub- 

 stances entering said systemic neuronal area must circulate, 

 or grow, from its proximal, to its distal extremity, and 

 be exuded, or shed, there, and that the nervous system, 

 generally is dual, in structure, and function, we also 

 assert our reasons for making this assertion, however, 

 we shall attempt to present in some detail. 



