part of develops from embryonic/larval midgut gastric caecum Blind sac that branches from the anterior-most region of the embryonic/larva midgut (ventriculus). There are four of these per animal. Their cells have a similar morphology to those of the midgut epithelium. embryonic/larval gastric caecum fly_anatomy.ontology FBbt:00001877 FBbt:00005781 larval gastric caecum gastric caecum primordium anterior endoderm derivative larval caeca region diverticulum of gut