n8 



J. B. JOHNSTON. 



ward or backward in the cord, and the central processes run 

 with the root fibers in the dorsal bundles of the same side. 

 More cells of this type are impregnated than of either of the 

 others but only enough have been drawn in the figures to illu- 



FIG. 2. Horizontal section of the cord 

 between the tenth and eleventh dorsal 

 nerves. The form of the nerve roots 

 shown is characteristic of this region of 

 the body. On the right side are two very 

 coarse fibers with their ganglion cells. 



FIG. 3. Horizontal section show- 

 ing especially fibers going to the op- 

 posite side of the cord. 



strate their position. (3) Bipolar cells in the root or trunk of 

 the nerve whose central processes are seldom impregnated far 

 into the cord. Those that are impregnated enter the dorsal 

 bundles of the same side. Many root fibers are impregnated 

 which show no cells connected with them. These all run for- 

 ward or backward in the dorsal bundles of the same side. They 



