stage 5 neuroblast FBbt:00001420 S5 neuroblast fly_anatomy.ontology VFB:FBbt_00001420 A neuroblast delaminating in the fifth and final wave of neuroblast delamination from the ventral neurectoderm. This wave begins during embryonic in late stage 11. The S5 neuroblasts delaminate into columns in between the existing intermediate and lateral columns of neuroblasts (Doe, 1992). neuroblast