Reflex changes in ureter movements produced by noxious stimulation of the skin in anesthetized rats / 全日本鍼灸学会雑誌

ABSTRACT

The effect of non-noxious and noxious stimulation of various skin areas on peristaltic movements of the ureter was examined in anesthetized rats. Experiments were performed on 17 rats anesthetized with urethane-chloralose under artificial respiration. Peristaltic movements of the ureter were continuously recorded by means of an electromyogram recording technique on a polygraph, and either pinching or brushing mechanical stimulation for one minute was delivered to a skin area such as neck, chest, abdomen, perineum or hindpaw.<br>Under the resting condition without cutaneous stimulation, regular peristaltic movements of the ureter at a frequency of 18+1/min (mean+S. E.) were observed. The frequency of these peristaltic movements was often increased significantly by noxious cutaneous stimulation to hindpaw, perineum or chest, while it was sometimes excited by the noxious stimulation to the other area, such as neck and abdomen. The non-noxious stimulation of various skin areas, however, did not influence these movements.<br>The increased frequency of the ureteral movements by pinching of hindpaw, perineum or chest after bilaterally sectioning vagal, hypogastric or pelvic nerves persisted, but were totally abolished after bilaterally sectioning splanchnic nerves.<br>It is suggested that splanchnic nerves play a substantially important role as a efferent arc in production of the reflex response of peristaltic movements of the ureter following the cutaneous noxious stimulation.