A new, possibly serotonergic, neuron in the lamina of the blowfly optic lobe: an immunocytochemical and Golgi-EM study.

With a modified Golgi impregnation technique a new neuron type, with extensive tangential processes, was discovered in the optic lamina of the blowfly, Calliphora erythrocephala. This cell is unusual since the majority of its varicose processes reside in a layer distal to the synaptic layer of the lamina. Using antibodies to 5-HT it was found that this new cell type was 5-HT immunoreactive, and varicosities of Golgi impregnated neurons analyzed electron-microscopically contain dense core vesicles.