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Immunocytochemical characterization of the accessory medulla in the cockroach Leucophaea maderae

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Abstract

Several lines of evidence suggest that pigment-dispersing hormone-immunoreactive neurons with ramifications in the accessory medulla are involved in the circadian system of insects. The present study provides a detailed analysis of the anatomical and neurochemical organization of the accessory medulla in the brain of the cockroach Leucophaea maderae. We show that the accessory medulla is compartmentalized into central dense nodular neuropil surrounded by a shell of coarse fibers. It is innervated by neurons immunoreactive to antisera against serotonin and the neuropeptides allatostatin 7, allatotropin, corazonin, gastrin/cholecystokinin, FMRFamide, leucokinin I, and pigment-dispersing hormone. Some of the immunostained neurons appear to be local neurons of the accessory medulla, whereas others connect this neuropil to various brain areas, including the lamina, the contralateral optic lobe, the posterior optic tubercles, and the superior protocerebrum. Double-label experiments show the colocalization of immunoreactivity against pigment-dispersing hormone with compounds related to FMRFamide, serotonin, and leucokinin I. The neuronal and neurochemical organization of the accessory medulla is consistent with the current hypothesis for a role of this brain area as a circadian pacemaking center in the insect brain.

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Authors and Affiliations

  1. Institut für Zoologie/Bio I, Universität Regensburg, D-93040, Regensburg, Germany

    Bernhard Petri, Monika Stengl, Stefan Würden & Uwe Homberg

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  1. Bernhard Petri
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  2. Monika Stengl
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  3. Stefan Würden
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  4. Uwe Homberg
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Petri, B., Stengl, M., Würden, S. et al. Immunocytochemical characterization of the accessory medulla in the cockroach Leucophaea maderae . Cell Tissue Res 282, 3–19 (1995). https://doi.org/10.1007/BF00319128

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  • DOI: https://doi.org/10.1007/BF00319128

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