Fig. 2. Serotonin enhances the optical response in the antennal lobe (AL) but not the antennal nerve (AN). (A) Real image of the brain demonstrating the regions from which measurements of the optical responses were made in the AN (100 pixels, representing an area of 70 µmx70 µm) and macroglomerular complex (MGC; 384 pixels, representing an area of 168 µmx112 µm). Scale bar, 200 µm. OL, optic lobe; Oe, oesophagus; PC, protocerebrum; SOG, suboesophageal ganglion; Gs, ordinary glomeruli. (B) Serotonin had virtually no effect on the optical response in the AN. Gray line, control optical response; black line, optical response following serotonin application. (C) The optical response in the MGC was greatly enhanced by serotonin. F, change in fluorescence; F, background fluorescence.

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