The middle part of the alimentary canal from the stomach, or entrance of the bile duct, to, or including, the large intestine.
The central region of the crustacean gut. Unlike the fore and hind gut, this region lacks cuticle.
the central portion of the forming gastrointestinal tract (fore-, mid, hind-), opening on the ventral embryo surface into the yolk sac. In later development mid-duodenum to splenic flexure of colon. (More? Gastrointestinal Tract Notes)