THE CENTRAL NERVOUS SYSTEM 



789 



of white fibres in their course is possible in the intact body ; 

 and the only impulses with which we need concern ourselves 



Cere bral 

 Cortex 



De cussation. 



? rm in al Arbo ris 

 jr amidol* 



around Cell of 

 Ant Horn 



Po\n$ 



.ue cassation -\--\ 



of Pyramids. \ \ 



Fibre of Direct^ . 



Nerve -Cell ' s 



\\\ \ I Medulla 



\Ifnc rcsstd Fil re. I 





Anterior 



Fibre 



A 



e. ren/- P 



FIG. 336. SOME POSSIBLE PATHS OF EFFERENT IMPULSES IN THE CENTRAL 

 NERVOUS SYSTEM (SCHEMATIC). 



Details are omitted from the scheme. For instance, each pyramidal fibre is 

 represented as arborizing around one anterior cornual cell only, and no collaterals 

 are shown. The hypothetical intercalated neurons between the pyramidal fibres 

 and the anterior horn cells (p. 776) are not shown. 



here are those that reach the conducting paths from grey matter 

 in the cord itself or in the brain, or from the peripheral organs. 



