Figure 6.
Focal electrical stimulation of sympathetic noradrenergic synaptic inputs to submucous plexus neurons evoked IPSPs. Application of the α-noradrenergic receptor antagonist phentolamine reversibly abolished the stimulus-evoked IPSPs. (a) Control IPSP. (b) Blockade of the IPSP in the presence of 1 μM phentolamine. (c) Recovery of IPSP after washout of phentolamine The neuron had multiple short, clublike dendrites and a single long process.