The cavernoso-anal reflex:response of the anal sphincters to cavernosus muscles'stimulation  

海绵体-肛门反射:肛门括约肌对海绵体肌肉受刺激的反应

作　　者：AhmedShafik IsmailShafik AliA.Shufik Olfat El Sibai 

机构地区：[1]Department of Surgery and Experimental Research.Faculty of Medicine.Cairo University,Cairo 11121,Egypt [2]Department of Surgery,Faculty of Medicine,Menoufia University,Shebin El-Kom,Egypt

出　　处：《Asian Journal of Andrology》2006年第A03期331-336,388,共5页亚洲男性学杂志（英文版）

摘　　要：Aim:To prove the hypothesis that cavernosus muscles'contraction during coitus affects the reflex contraction of anal sphincters.Methods:Electromyographic response of external and internal anal sphincters to ischiocavernosus and bulbocavernosus muscle stimulation was studied in 17 healthy volunteers(10 men.7 women,mean aged 38.3± 11.6 years).The test was repeated after individual anesthetization of anal sphincters and the two cavernosus muscles, and after using saline instead of lidocaine.Results:Upon stimulation of each of the two cavernosus muscles, external and internal anal sphincters recorded increased electromyographic activity.Anal sphincters did not respond to stimulation of the anesthetized cavernosus muscles nor did anesthetized anal sphincters respond to cavernosus muscles'stilnulation.Saline infiltration did not affect anal sphincteric response to cavernosal muscles'stimulation. Conclusion:Cavernosus muscles'contraction is suggested to evoke anal sphincteric contraction,which seems to be a reflex and mediated through the'cavernoso-anal reflex'.Anal sphincteric contraction during coitus presumably acts to close the anal canal to thwart flatus or fecal leak.Aim:To prove the hypothesis that cavernosus muscles'contraction during coitus affects the reflex contraction of anal sphincters.Methods:Electromyographic response of external and internal anal sphincters to ischiocavernosus and bulbocavernosus muscle stimulation was studied in 17 healthy volunteers(10 men.7 women,mean aged 38.3± 11.6 years).The test was repeated after individual anesthetization of anal sphincters and the two cavernosus muscles, and after using saline instead of lidocaine.Results:Upon stimulation of each of the two cavernosus muscles, external and internal anal sphincters recorded increased electromyographic activity.Anal sphincters did not respond to stimulation of the anesthetized cavernosus muscles nor did anesthetized anal sphincters respond to cavernosus muscles'stilnulation.Saline infiltration did not affect anal sphincteric response to cavernosal muscles'stimulation. Conclusion:Cavernosus muscles'contraction is suggested to evoke anal sphincteric contraction,which seems to be a reflex and mediated through the'cavernoso-anal reflex'.Anal sphincteric contraction during coitus presumably acts to close the anal canal to thwart flatus or fecal leak.

关 键 词：bulbocavernosus muscle ischiocavernosus muscle erection sexual act ORGASM erectile dysfunction 

分 类 号：R33[医药卫生—人体生理学]