PHYSIOLOGICAL CHANGES IN THK CENTRAL SYSTEM. 279 



FIG. 62. Schema of the 

 arrangement of the 

 nerve cells in the cen- 

 tral system. (Schafer, 

 in Quain's Anatomy?) 

 C, cerebral cortex ; c, 

 callosum ; Cb., cere- 

 bellum ; Cd., cord; M, 

 muscle; S, skin. In all 

 cases the direction of the 

 nerve impulse leaving a 

 nerve cell is from the 

 cell-body to the brush 

 at the end of the neuron. 

 The only exception is in 

 the case of cell 6, where 

 impulses arriving at the 

 cell-body from the peri- 

 phery travel from the 

 brush at S, over the fibre 

 7, towards the cell-body. 



ca. 



