continuous with develops from larval tracheal branch of Tr10 caudal-hindgut tracheal branch caudal tracheal branch fly_anatomy.ontology CaB FBbt:00000404 Primary tracheal branch that arises as a posterior bifurcation of the caudal-hindgut branch of tracheal metamere 10 (A8) and splits into 4 branches that project posteriorly. dorsal ectoderm derivative abdominal tracheal primordium 8 primary tracheal branch