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- W1991056879 abstract "Experiments were performed on chloralosed cats with ligated adrenals. The peripheral ends of the preganglionic sympathetic nerves to the colon were stimulated and colonic motility was monitored by a volumetric method. Electric nerve stimulation with various intensities elicited inhibitory motor responses and occasionally contractions. Hexa-methonium and/or guanethidine blocked all inhibitory actions and revealed pure excitatory responses at high stimulation intensities. These colonic contractions were inhibited by atropine. However, atropine-resistant contractions were sometimes observed, predominantly in the colorectal region. Thoracic sympathetic nerves affected the motility in the proximal colon only, while lumbar sympathetic nerves acted on both proximal and distal parts. Strength-duration relationships and sensitivity to local heating suggest that the excitatory responses are due to an antidromic activation of thin, possibly afferent nerve fibres. Small doses of substance P injected close i.a. induced colonic contractions unchanged by hexamethonium and/or guanethidine but sensitive to atropine. The neurally-induced colonic contractions are suggested to be due to an antidromic activation of thin sensory neurons which in the periphery release substance P, in turn activating cholinergic motor neurons, thus constituting an axon reflex arrangement. The possibility of a similar axon reflex mechanism, associated to thin afferents, activating adrenergic inhibitory neurons at the prevertebral ganglionic level is discussed." @default.
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- W1991056879 date "1985-03-01" @default.
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- W1991056879 title "Non-nicotinic, non-adrenergic excitatory motor fibres in the preganglionic sympathetic supply to the feline colon. An axon reflex arrangement associated to thin sensory neurons, involving substance P?" @default.
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- W1991056879 doi "https://doi.org/10.1111/j.1748-1716.1985.tb07588.x" @default.
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