Tbxt-fig. 41. Myogram, vastocrureus muscle, decerebrate preparation, showing postural 

 tone and reflex contraction, and reflex inhibition of both (C. W. Armstrong and A. E. Thomas). 

 Uppermost line, muscle trace ; upper signal-line marks time of stimulation of central end 

 of severed ipsilateral peroneal nerve ; lower signal-line, time of stimulation of central end of 

 severed contralateral peroneal nerve ; t, time in seconds. At beginning the muscle shows 

 a certain degree of steady postural (tonic) contraction ; stimulation of contralateral afferent 

 nerve (r. sciatic) evokes a strong reflex contraction, the muscle- record rising from the tonic line ; 

 stimulation of ipsilateral afferent (I. sciatic) causes immediate relaxation not only of the 

 contralateral reflex but of the postural contraction as well, although the faradization of 

 contralateral afferent is maintained unaltered all the time. Stimulation of ipsilateral 

 afferent is then withdrawn and, after a marked though brief latency, postural contraction and 

 contralateral reflex return to their full previous amount. Contralateral stimulation is then 

 withdrawn and the contralateral reflex subsides ; a residue of postural contraction (tone) remains. 

 The vertical arcs recorded show the relative * longitudes ' in relation to the signal-marks. 



