Body surface stimulation and rectal motility

Hiroko Ikeda MA, Yoshihiro Aikawa PhD, Dipl Ac, Eitaro Noguchi PhD, Dipl Ac
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Abstract

The effects of mechanical stimulation on various skin areas on rectal motility were examined in anesthetized rats as a model of human. The rectal motility was measured by the balloon method at a position about 4–6 cm from the anus. Mechanical stimulation of the perineum induced a characteristic contraction of the rectum. Stimulation of the other skin areas did not produce any responses in the rectal motility. After the spinal transection at the 1st to 2nd cervical level, stimulation on the hindpaw and lower abdomen as well as the perineum induced the characteristic contraction of the rectum. These responses were abolished by severance of the pelvic nerves. After the severance of the sympathetic nerves innervating the rectum, the rectal motility increased its frequency, behind which the stimulation-induced responses were hidden and could not be observed. These results indicate that rectal motility was modulated by cutaneous mechanical stimulation through a segmental spinal reflex mechanism in anesthetized rats.

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体表刺激和直肠运动
以麻醉大鼠为模型,观察了不同皮肤部位的机械刺激对直肠运动的影响。在距肛门约4 ~ 6cm处用球囊法测量直肠运动。会阴的机械刺激引起直肠的特征性收缩。刺激其他皮肤区域对直肠运动没有产生任何反应。在颈椎第1至第2位脊柱横断后,刺激后爪、下腹部以及会阴,引起直肠特征性收缩。这些反应被骨盆神经的切断所消除。在切断支配直肠的交感神经后,直肠运动频率增加,其背后隐藏着刺激引起的反应,无法观察到。这些结果表明,麻醉大鼠的直肠运动可通过节段性脊髓反射机制受到皮肤机械刺激的调节。
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