The lateral protocerebrum - optic neuropils. A, B: The detailed 3D-reconstruction of the left brain hemisphere is shown from dorsal and ventral (see inserted brain orientations). The corresponding cell clusters (blue) are displayed semitransparently. C: Inverted picture of a horizontal vibratome section labeled for SIFamide-like immunoreactivity (SIF; black). D: Horizontal vibratome section triple labeled against cell nuclei (NUC; blue), synapsin (SYN; red) and allatostatin-like (AST; green) immunoreactivity in higher magnification from Fig. 3A. The arrows mark several bypass fibers originating from the medulla (M). Based on the boxed area in D, the single ASTir-channel (white) is shown in higher magnification in E to visualize the crossed fibers of the inner optic chiasm (ICh). F: Silver impregnation of a microtome slice is shown in the same section plane as in D. Numbers 1 to 3 identify cell clusters. Other abbreviations: HN, hemiellipsoid neuropil; La, lamina; Lo, lobula; LoP, lobula plate; OCh, outer optic chiasm; OT, optic tract; TM, terminal medulla.