278 Prof, C. 8. Sherrington. [ Ape. re 
“crossed extension reflex,” an afferent nerve or point of skin suitable for 
exciting the “flexion reflex” in its own limb. The same is demonstrable also 
in the fore limb with the muscles acting antagonistically at the elbow. The 
phenomenon can be also obtained at the knee in the direction reverse to that 
illustrated by the above example; while an isolated hamstring muscle is 
recording its reflex contraction by the myograph in response to appropriate 
stimulation of the skin of its own limb, the “crossed extension reflex” is 

Fic. 4.—Similar to fig. 3, except that the inhibiting stimulus was weak faradisation 
applied to the proximal] end of the severed “ hamstring nerve.” 
induced. Inhibition of the active reflex contraction of the hamstring muscle 
occurs, and its extent can be graded as mentioned above and illustrated in 
the tracing figured here (fig. 5). 
The inhibition can take effect either during the application of the stimulus 
that excites the reflex inhibited or during the after-discharge of that reflex. 
In the former case the interrupted reflex contraction returns—at least it does 
