May 1984
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117 Reads
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25 Citations
Journal of the Autonomic Nervous System
In anesthetized cats, thermal stimulation of esophagus, stomach and duodenum, activates 3 kinds of thermoreceptors: warm, cold and mixed thermoreceptors. Responses of sensory vagal units were recorded in the nodose ganglion by means of extracellular glass microelectrodes. Analysis of conduction velocities (values ranged between 0.7 and 1.5 m/s) shows that the temperature receptors activate unmyelinated vagal fibers (C-fibers).From the study of the role of these receptors, it is concluded that thermoreceptors intervene in digestive motility contraction. In intact animals, the heating of thoracic esophagus and stomach, provokes a partial inhibition of the contraction at the cervical level of esophagus. The contrary effect was obtained by cooling.On the other hand, after cervical bivagotomy, the phenomena elicited by cold and warm stimulations were reversed.