Summary
Serotonin-immunoreactive (5-HTi) neurons were mapped in the larval central nervous system (CNS) of the dipterous flies Calliphora erythrocephala and Sarcophaga bullata. Immunocytochemistry was performed on cryostat sections, paraffin sections, and on the entire CNS (whole mounts).
The CNS of larvae displays 96–98 5-HTi cell bodies. The location of the cell bodies within the segmental cerebral and ventral ganglia is consistent among individuals. The pattern of immunoreactive fibers in tracts and within neuropil regions of the CNS was resolved in detail. Some 5-HTi neurons in the CNS possess axons that run through peripheral nerves (antenno-labro-frontal nerves).
The suboesophagealand thoracico-abdominal ganglia of the adult blowflies were studied for a comparison with the larval ventral ganglia. In the thoracico-abdominal ganglia of adults the same number of 5-HTi cell bodies was found as in the larvae except in the metathoracic ganglion, which in the adult contains two cell bodies less than in the larva. The immunoreactive processes within the neuropil of the adult thoracico-abdominal ganglia form more elaborate patterns than those of the larvae, but the basic organization of major fiber tracts was similar in larval and adult ganglia. Some aspects of postembryonic development are discussed in relation to the transformation of the distribution of 5-HTi neurons and their processes into the adult pattern.
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Nässel, D.R., Cantera, R. Mapping of serotonin-immunoreactive neurons in the larval nervous system of the flies Calliphora erythrocephala and Sarcophaga bullata . Cell Tissue Res. 239, 423–434 (1985). https://doi.org/10.1007/BF00218023
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DOI: https://doi.org/10.1007/BF00218023