Full Digestive System of the Lower Torso Description
[Continued from above] . . . intestine. This organ has three parts: the duodenum (part of this organ extends into the upper gastrointestinal tract); the jejunum, which is the intestine's midsection; and the ileum. The digestive system of the lower abdomen also houses the large intestine, which has three parts: the cecum (attached to the cecum is the vermiform appendix); the colon, which is critical in the absorption of water and the production of vitamin K; and the rectum. The final organ within the lower gastrointestinal tract is the anus.