Fig. 5.

Effect of firing CC5 on unit activity recorded from the cerebral ganglion end of the ipsilateral CBC. CC5 was identified as usual by its effect on the PAS as recorded in the ipsilateral PAn. A, In normal ASW, firing of CC5 evoked a burst of activity in the CBC. B, CC5 no longer evoked activity when the cerebral ganglion was bathed in a solution that blocks chemical synapses (4× Mg²⁺, 0.1× Ca²⁺). The effect on PAS, which is located in the pedal ganglion, shows little or no change. C, The capacity of CC5 to evoke unit activity in the CBC recovers when the cerebral ganglion is washed in ASW (n = 6).