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The parasympathetic will assist in excreting urine from the bladder or defecation. Stimulation of the parasympathetic will cause the detrusor muscle. Also, parasympathetic stimulation of the internal anal sphincter will relax this muscle to allow defecation. Defecation is the final act of digestion, by which organisms eliminate solid, semisolid, or liquid waste material from the digestive tract via the anus. Humans expel feces with a frequency varying from a few times daily to a few times weekly. Waves of muscular contraction (known as peristalsis) in the walls of the colon move fecal matter through the digestive tract towards the rectum. Digital rectal stimulation digital rectal stimulation often provides safe and effective constipation relief, with the advantage that it can be performed at home by untrained personnel. The basic technique involves gentle insertion of a gloved, lubricated finger--or for babies and young children, a lubricated metal or plastic thermometer or cotton swab--into the constipated persons rectum. Obstructed defecation is a disorder of function attributable to either an inadequate pushing force or an inability to overcome resistance to expulsion caused by inadequate relaxation of the external anal sphnicter (i. 10 in addition to excessive straining during defecation, other features of obstructed defecation.). Though resting sphincter tone is predominantly attributed to the internal anal sphincter, studies under general anesthesia or after pudendal nerve block suggest the external anal sphincter generally accounts for approximately 25, and up to 50, of resting anal tone. 9, 33, 40, 50, 144, 170 when continence is threatened, the external sphincter contracts to augment anal tone, preserving continence. Intrinsic defecation reflex results in feces moving from the sigmoid colon to rectum 2. The parasympathetic defecation reflex helps relax the internal anal sphincter. during electrical stimulation of s2 root, the rectal neck (anal canal) pressure exceeded the rectal pressure, thus rectal balloon expulsion did not occur. However, as the pressure of anal canal reduced more rapidly than that of the rectum, rectal balloon expulsion occurred in all 11 dogs as a post-stimulus defecation, which was similar to post-stimulus voiding. The defecation reflex triggers the two main sphincters around the anal canal. The first is the internal anal sphincter, which is a muscle that cant be controlled voluntarily. Digital stimulation is a way to empty the reflex bowel after a spinal cord injury. It involves moving the finger or dil stick around in a circular motion inside the rectum. By doing this, the the bowel reflex is stimulated and the rectal muscles open and allow the stool to leave the body. Sacral nerve stimulation for intractable constipation michael a kamm,1,2 thomas c dudding,2 jarno melenhorst,3 michael jarrett,2 zengri wang,4 steen buntzen,5 claes johansson,6 sren laurberg,5 harald rosen,7 carolynne j vaizey,2 klaus matzel,8 cor baeten3 abstract objective traditional surgical procedures for intractable.