478 



PRINCIPLES OF GENERAL PHYSIOLOGY 



sisting of the axones of giant pyramidal cells, the " Betz cells," of a particular layer 

 in the grey matter of the cortex. These axones form synapses with certain inter- 



A 



t 



DIAGRAM OK MAMMALIAN CENTRAL NERVOUS 

 ACCORDING TQ VON MONAKOW AND MOTT. 



Shows the elaborate system of association neurones, arranged as 

 parallel or alternative paths between the primary sensory neurone" 

 (S) and the final common paths (M). 



mediate neurones as far away as the distant end of the spinal cord and ultimately 

 with the motor neurones of the final common path. These Betz cells are found to 

 disappear when the axones forming the pyramidal tract are cut through. Fig. 148 

 (Holmes and May, 1909) shows this fact. The view that the pyramidal fibres do 



