Systema digestorium is the scientific term for the human digestive system, and there are several synonyms that can be used to refer to it. These include the alimentary canal, gastrointestinal tract, or simply the digestive tract. The term gastrointestinal system is also used to encompass the organs and structures involved in digestion, such as the mouth, esophagus, stomach, small intestine, large intestine, pancreas, liver, and gallbladder. Other synonyms for the systema digestorium include the digestive apparatus, digestive system, or digestive organ system. In general, these synonyms all refer to the organs and processes involved in breaking down food and extracting the nutrients and energy it provides for the body.