part of develops from endoderm anterior endoderm anlage stage 7 embryo stage 8 embryo anterior endoderm antEndoP2 anterior midgut rudiment fly_anatomy.ontology FBbt:00005521 anterior endoderm primordium antMGRudP2 FBbt:00005524 The anterior part of the endoderm from its invagination during stage 7 to the epithelial-to-mesenchymal transition in late stage 8 when it become anterior midgut primordium. The invaginating anterior endoderm makes a short furrow that forms the cross bar of a T whose stem is the ventral furrow. After invagination, the cells divide once before the mesenchymal to epithelial transition. FBbt:00005559 antEndo multicellular structure