A-C. Three levels of focus through the brain of Calliphora erythrocephala showing neurons originating above the protocerebral bridge, with dendrites in the bridge, sending axons to the central body. This level also shows the bipartite division of the noduli with axons extending to the ventral bodies. These symmetrical patterns of cell staining were achieved by focal injection of cobalt into the right ventral body. This series is from a brain tilted slightly such that the posterior protocerebral bridge was in the same plane of section as the noduli. Note the labeling in the noduli, showing the outer shell of immunoreactivity corresponding to similarly disposed processes seen in Golgi preparations of Drosophila .
Note also thelarge immunofluorescent cell bodies in the pars intercerebralis.
Dr. N.J. Strausfeld, University of Arizona.