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.
A less common possibility is that you have a physical problem in your intestines, such as a blockage or tumor, that's preventing the stool from passing through. When constipation lingers for three weeks or more, get a check-up just to make sure a medical condition isn't causing the problem.