Stage 12

D/T: fiber tract founder cluster at the deutero- and tritocerebrum

A/PDSG: anterior/posterior deuterocerebral cluster of surface glia precursors

BPLG: basal procephalic cluster of longitudinal glia precursors

DPSG: dorsal protocerebral cluster of surface glia precursors

VPSG: ventral protocerebral cluster of surface glia precursors

fg: frontal ganglion

ol: optic lobe

P3l, P4l: fiber tract founder clusters of the protocerebrum