Best Answer: The peripheral nervous system, which it is a component of. The sympathetic and parasympathetic systems are components of the autonomic nervous system.
Also, make the call if: 1  Constipation is a new problem for you. 2  You have blood in your stool. 3  You are losing weight even though you are not dieting.  You have severe pain with bowel 1  movements. Your constipation has lasted more than 2 weeks.  You have pencil-thin stools.
Bowels habits vary from person to person . Three bowels a day to one bowel once in three days is considered normal , however there is no universally accepted definition of the same . People with irritable bowel syndrome can stay constipated for days without much untoward effect on health . So seek medical attention if constipation is new to you or is associated with 'red flag  signs .