digestive tract, a musculomembranous tube, about 9 meters long, extending from the mouth to the anus and lined with mucous membrane. Its various portions are the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The tube, which is part of the digestive system, includes numerous accessory organs. Also called alimentary canal, alimentary tract, gastrointestinal tract, intestinal tract. See also digestive system.
