Fig. 6. Inhibitory synaptic responses and muscle relaxations triggered by the opener inhibitor (OI) and the common inhibitor (CI). (A) Upper trace shows inhibitory junction potentials (IJPs) elicited by single stimuli (indicated by arrows) to OI and to CI; lower trace shows the corresponding relaxation in muscle tension. Scale bar, 0.1 mV, 4 mg, 1 s. (B) Upper trace shows synaptic responses to identical 10 Hz trains of stimuli delivered to OI and CI; lower trace shows the corresponding relaxation of muscle tension. The timing of stimulus trains is indicated by horizontal black bars. Scale bar, 0.5 mV, 12.5 mg, 2 s.