486 



MESSRS. F. GOTCH AND V. HORSLEY 



which, when this is very intense, might possibly occur in the case of the short 

 anterior root. 



These experiments not only illustrate in a very striking manner the extent of the 

 block to the passage of impulses backwards through the efferent side of a spinal 



Fur. 19. 



nerve centre, they also afford information upon the nature of the anatomical con 

 nections of the anterior root fibres with the cord. The histological enumerations of 

 BlBGE, the developmental researches of His, and the extent of descending degenera 

 tion in efferent tracts, have combined to indicate that all the fibres of the anterior 

 roots are in connection with nerve cells lying in the immediate neighbourhood of their 



