16 



ATLAS OF NERVE CELLS 



These are indicated in the diagram. Their neuraxons pass out into the adjacent white columns 

 of the cord, where they bifurcate, one division turning upward, the other downward. These 

 neurons have as their function to associate the action of various segments or levels of the 

 cord. They are termed Strangzellen by German writers, who classify and name them according 

 to the column into which their neuraxon passes. They may be called the intrinsic cells of the 

 cord. Lenhossek 1 affirms that some of these cells appear to send out a neuraxon which 

 divides into two parts, each of which goes to a separate column. In the diagram it will be 

 seen that these intrinsic cells (e) send neuraxons into all the various columns. One set of 

 these cells should be especially noticed, which send their neuraxons upward in the periphery 



VII 



IX 



VIII 



FIG. i. 

 FlG. I. Diagram of a transverse section of the spinal cord. 



On the right side the columns of the cord are shown and the fibres entering the gtay matter from these columns. /, anterior median column. 

 //, antero-lateral column. ///, lateral limiting layer. IV, ascending antero-lateral tract of Gowers. V, direct cerebellar column. VI, pyramidal 

 column. VII, Lissauer's column. VIII, column of Burdach. IX, column of Goll. 



The posterior nerve roots are shown on the right side of the diagram and their various methods of termination in the gray matter. /, fibre 

 entering Lissauer's tract. 2, fibre entering posterior horn, j, fibre entering posterior horn and terminating deep within it. 4, fibre entering 

 column of Burdach. 5, fibre passing to root zone of column of Burdach and sending the collateral fibre to the anterior horn. 6, fibre entering 

 root zone and sending collateral to the Clarke column of cells. 7, fibre entering root zone and passing by way of the gray commissure to the 

 opposite side of the cord. S, fibre entering posterior horn through root zone having come up from a lower level. 



On the left side the various cells of the gray matter are shown, a, motor cells with motor nerve roots passing out of the cord, b, intrinsic 

 cells of the posterior horns: one lies on the margin, is a "border cell" ; the other lies deep within the horn, they send neuraxons into the 

 posterior and lateral columns respectively, c, intrinsic cell of the posterior horn ; Golgi's second type, d, cell of the column of Clarke with its 

 neuraxon passing outward to the direct cerebellar column, t, intrinsic cells of the anterior and median gray with their neuraxons passing into the 

 antero-lateral column. /, intrinsic cell in median gray sending its neuraxon to the ascending tract of Gowers. g, commissural cells in the median 

 gray sending their neuraxons to the other side of the cord. A, sensory cell sending neuraxon to opposite column of Gowers. 



1 Lenhossdk, Der feinere Bau des Nervensystems. 1895. 



