part of develops from embryonic/larval midgut FBbt:00001882 FBbt:00005825 fly_anatomy.ontology Middle part of the embryonic/larval alimentary canal. The midgut runs from the proventriculus to its posterior end, where it meets the hindgut, immediately anterior to the insertion of the Malpighian tubules. In the larva, there are the 4 gastric caeca at the anterior end. larval midgut midintestine midgut embryonic/larval gut fused midgut primordium