INHIBITION AT THE NFAJ ROMUSCU L AR JUNCTION IN CRAYFISH 



113 



Fig. 2. Simultaneous intra- and extra-cellular records, as in Fig. !, three con- 

 secutive junctional potentials superimposed at rate of I /sec. a. E.j.p.'s alone. 

 Failure of transmission occurs once in extracellular record. Arrow marks extra- 

 cellularly recorded motor nerve impulse near the junction, b. Inhibitory stimulus 

 preceding excitatory one by 2 msec, reducing the intracellular e.j.p.'s and 

 resulting in two failures of transmission at the single junctional area. Arrows 

 mark inhibitory and excitatory nerve impulses. 



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 DuDEL, J. and Kuffler, S. W. (1960) A second mechanism of inhibition at the crayfish 



neuromuscular junction. Nature 187 : lAl-lA^. 

 DuDEL, J. and Kuffler, S. W. (1961a) The quantal nature of transmission and spontaneous 



miniature potentials at the crayfish neuromuscular junction. J. Physiol. (London). 



In press. 

 Dudel, J. and Kuffler, S. W. (1961b) Mechanism of facilitation at the crayfish neuro- 

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