part of develops from develops into posterior ectoderm Region of the ectoderm found posterior to the dorsal, lateral and ventral regions of the ectoderm and anterior to the posterior endoderm (Stathopoulos and Newcomb, 2020). It forms the hindgut (Stathopoulos and Newcomb, 2020). FBbt:00000122 fly_anatomy.ontology proctodeal ring developing embryonic structure hindgut trunk ectoderm posterior ectoderm anlage