part of adult proventriculus adult cardial valve https://github.com/FlyBase/drosophila-anatomy-developmental-ontology/issues/24 adult stomodeal valve FBbt:00003140 adult oesophageal valve A deep fold in the posterior-most part of the adult foregut epithelium that is formed by the two inner layers of the adult proventriculus (cardia). The space between the two layers of this fold, hilus of the cardia, is filled with longitudinal muscle fibers. The cells of the epithelium are cuboidal to columnar and are vacuolate. fly_anatomy.ontology adult stomadeal valve adult esophageal valve adult stomodaeal valve adult cardiac valve multi-tissue structure