part of embryonic neuroblast protocerebral neuroblast anterior protocerebral neuroblast In the embryo, individual neuroblasts are named according to their position relative to major morphological features (cephalic furrow, invaginating foregut, dorsal and ventral midline, their relative position with respect to each other, their time of segregation and their expression of markers) (Urbach et al., 2003). fly_anatomy.ontology Pa VFB:FBbt_00001335 FBbt:00001335 A neuroblast located in the anterior region of the protocerebrum. protocerebrum primordium