The digestive system. This figure represents the whole tract of the intestinal canal, not exactly in its natural position, but spread out so as to show the relative proportions; f, the esophagus; g, cardia; h, pylorus; i, i, the duodenum, about twelve fingers; breadth in length; k, hepatic duct; l, gall bladder; m, cystic duct; n, ductus communis, formed by the union of both; o, the opening of this duct into the duodenum; p, pancreatic duct; q, its opening into the duodenum; r, jejunum; s, ilium; these constitute the small intestines, and are about 26 feet in length, or five times the length of the body; t, termination of ilium in the coecum; , u, superior fold of valve of colon; v, inferior do. ; w, coecum; x, vermiform process; y, y, colon; z, rectum. The coecum, colon, and rectum, form the large intestines, and are about 6 feet in length; the coecum being about 4 inches long, and the same in diameter. The arrows show the direction which the food takes in digestion.