[Relationship between concentration and the character of the effect of adrenaline on the excitatibility of giant neurons].

The nature of the epinephrine action on the excitability of giant neurons depends on its concentration. With a concentration of 1-10(-5) M changes in electrophysiological parameters of the somatic neurons membrane produced by its bore proof to the rising and with that of 1-10(-4) M -- to its falling excitability. Propranolol was indifferent in regard to both epinephrine effects, while dihydroergotoxin abolished the inhibitory effect of epinephrine.