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- W2031505969 abstract "Isolated segments of guinea-pig small intestine were set up in a partitioned bath to study the enteric excitatory reflex evoked by distension. The gut was distended by a rubber balloon inserted at the aboral end and contractions of the circular muscle were recorded at the oral end. The oral and aboral ends of the gut were separated by an intermediate compartment of the bath. Inflation of the intraluminal balloon with 0.075-0.35 ml water elicited reproducible and distension-dependent contraction. This enteric orally directed (ascending) excitatory reflex was abolished by tetrodotoxin irrespective of the compartment in which it was applied. Hyoscine (0.3 microM) almost abolished the enteric excitatory reflex when it was applied to the oral compartment. This indicates that the transmission from the final motor neurons to the circular muscle is mainly cholinergic, acting via muscarinic receptors. Hyoscine had no effect on the enteric excitatory reflex when added to the intermediate compartment. When hyoscine was added to the aboral compartment, it decreased the enteric excitatory reflex elicited by low distension stimuli to 70% of control and decreased the enteric excitatory reflex elicited by higher distension stimuli to 95% of control. This indicates that ganglionic transmission involving muscarinic receptors at the site of distension in the aboral bath contributes to the enteric excitatory reflex. Hexamethonium (100 microm) greatly depressed the enteric excitatory reflex when applied to any compartment indicating that nicotinic transmission is most important in the afferent, intermediate and efferent components of the reflex and that the reflex pathway involves a polysynaptic chain of cholinergic interneurons.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2031505969 title "A pharmacological analysis of the neuronal circuitry involved in distension-evoked enteric excitatory reflex" @default.
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- W2031505969 doi "https://doi.org/10.1016/0306-4522(90)90071-b" @default.
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