154 



LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



The root-fibres of the motor nerves pass by the spinal 

 ganglia directly into the spinal cord, traverse the white substance, 

 and enter the anterior horn. It is very probable that the axis- 

 cylinders of all these lib res are connected with the large ganglion- 



Co 



Sao 



Sac 2 



D12 



C5 



FIG. 91. 



Sections through the spinal cord at different heights. The letters and figures show the 

 spinal nerves at the level of whose exit the section is made. (After Quain.) 



cells as shown in Fig. 92. These cells, which constitute the 

 first station of the motor innervation-tract, are so distributed 

 over the section of the spinal cord that we can make out (to the 

 left at m in Fig. 90) more or less distinctly a median and a 



