Abstract
Electromyographic responses of the cat duodenum were recorded in vitro up to 5 cm oral to the site of transmural nerve stimulation. Repetitive stimulation induced ascending cholinergic and non-cholinergic excitatory responses characterized by an increase in the slow wave amplitude and spiking activity. Ascending inhibitory responses were also recorded and were characterized by a suppression of the spiking activity and a decrease in the slow wave amplitude. The ascending cholinergic excitatory response was abolished by atropine. The non-cholinergic excitatory and inhibitory responses both disappeared in the presence of tetrodotoxin.
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