1NTI l; \< TIOM AMiiM, l;l H.l XI ^-~ 



tering the cord as motor fibers leaving it, hut also that each afferent 

 fiber, after its entry tu t lie cord, gives ofl BeveraJ collaterals, each of 

 which runs to some nerve center in the cord -■ ■ I - 207 



Certain conditions may break down the path along which the impul 

 passes; for example, at a certain stage in the actioi trychnine all 



pathways become opened ap, so thai the reflexes which ordinarily do 

 occur together, ad simultaneously, with the result thai a I cal convul- 

 sive movement is produced. Strychnine, as we have already seen, also 

 interferes with the sorting out of the impulses into inhibitory and ex- 

 citatory, so that no reciprocal action occurs. 



