part of develops from embryonic/larval foregut FBbt:00005768 Anterior-most part of the embryonic/larval alimentary canal. It opens anteriorly at the mouth and is composed of the atrium (to which the salivary glands are attached), the pharynx, and the esophagus and part of the proventriculus. foreintestine larval foregut fly_anatomy.ontology FBbt:00001862 foregut embryonic foregut embryonic/larval gut anterior ectoderm derivative