940 



HANDBOOK OF PHYSIOLOGY ^ NEUROPHYSIOLOGY II 



10 12 Msec. 



FIG. 14. A. Monosynaptic reflex facilitation of monosynaptic reflexes pertaining to one head of 

 gastrocnemius by Group I afferent volleys engendered in the nerve to the other head. B. Monosyn- 

 aptic reflex facilitation of monosynaptic reflex of biceps femoris posterior by Group I afferent volleys 

 from its synergist, semitendinosus. [From Lloyd {59).] 



_A_ 



FIG. 15. Heteronymous monosynaptic reflex transmission occurring in small amount in the period 

 following a high frequency stimulation of the aflferent nerve. Afferent pathway from medial gastroc- 

 nemius stimulated, recording from the motor nerve to the lateral gastrocnemius. Recordings, reading 

 from left to right and from above downward, were made each 2 sec. before, during a lo-sec. tetanus at 

 500 per sec. (stimulus artifacts seen in the second to sixth records of the top row) and after tctanization. 

 Last record, at bottom right, is time in msec. [From Lloyd et al. (64).] 



FIG. 16. A. Monosynaptic re- 

 flex inhibition of the tibialis an- 

 terior monosynaptic reflexes by 

 Group I afferent volleys from the 

 triceps surae. B. Monosynaptic 

 reflex inhibition of the triceps 

 surae by Group I afferent volleys 

 from the deep peroneal nerve 

 (representing ankle flexors and 

 digital dorsifle.xor) . [From Lloyd 

 (59)-] 



2 4 6 8 10 IZMsec 



10 IZ Msec 



