Definition
The sigmoid colon is the final S-shaped section of the large intestine, just before the rectum. It connects the descending colon to the rectum. Its primary function is to store fecal matter until it can be eliminated. Think of it as a flexible holding tank for waste. It helps regulate bowel movements. The sigmoid colon’s shape allows it to expand and contract as needed. Issues here can lead to constipation or diarrhea.