156 



LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



delicate fibrils, which permeates all the gray matter, and of 

 which it is still doubtful whether or not it is nervous tissue. 



The sensory roots, after passing through the spinal ganglia, 



Rp 



'- Op 



Co 



'^.L*'* -Ju.' u is!V;' Vl;.?_ > ? ktf - SjS^Crt\.'* . 



Caa 



Jin 



FIG. 93. 



Half of a section through the lumbar cord. Ra, anterior root; Rp, posteri9r root ; 

 Rip, inner portion of the posterior root ; Cp, posterior commissure; Caa, anterior com- 

 missure : Cc, central canal. The fine net-work of moduli irv fibres in the srray matter and 

 the net-work of medullary fasciculi in the otherwise gray posterior commissure are not 

 shown. (After Deiters.) 



run in part direct to the posterior horn and in part to the 

 posterior white columns. The cell-complex of the spinal gan- 

 glion is the real source from which these fibres arise. You 

 recollect that embryology shows that the cells of this ganglion 



