The alimentary tract in the abdomen consists of the lower oesophagus , the stomach , the duodenum , the jejunum , ileum , the caecum and the appendix , the ascending , transverse and descending colons , the sigmoid colon and the rectum .

• 腹腔内的消化道器官有：下食道、胃，十二指肠、空肠、回肠、盲肠和阑尾、升结肠、横结肠、降结肠、乙状结肠以及直肠。