Information AboutRectum |
| CATEGORIES ABOUT RECTUM | |
| digestive system | |
| pelvis | |
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The Rectum (from the Latin Verb regere "to straighten, correct, rule" hence the rectum is "that which is ruled, controlled") is the final Straight portion of the Large Intestine in some Mammal s, and the Gut in others, terminating in the Anus . THE RECTUM IN HUMAN DEFECATION The rectum ampulla acts as a temporary storage facility for Feces . As the rectal walls expand due to the materials filling it from within, stretch receptors from the nervous system located in the rectal walls stimulate the desire to Defecate . If the urge is not acted upon, the material in the rectum is often returned to the Colon where more water is absorbed. If defecation is delayed for a prolonged period Constipation and hardened feces results. When the rectum is full the increase in intrarectal pressure forces the walls of the Anal Canal apart allowing the fecal matter to enter the canal. The rectum shortens as material is forced into the anal canal and Peristaltic Wave s propel the feces out of the rectum. The internal and external Sphincter allow the feces to be passed by muscles pulling the anus up over the exiting feces. SEXUAL STIMULI Due to the proximity of the anterior wall of the rectum to the Vagina in females or to the Prostate in males and the shared nerves thereof, rectal Stimulation can result in Sexual Arousal . For further information on this aspect, see Anal Sex . SEE ALSO |
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