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Comparative anatomy of pigment-dispersing hormone-immunoreactive neurons in the brain of orthopteroid insects

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Summary

In a comparative study, the anatomy of neurons immunoreactive with an antiserum against the crustacean β-pigment-dispersing hormone was investigated in the brain of several orthopteroid insects including locusts, crickets, a cockroach, and a phasmid. In all species studied, three groups of neurons with somata in the optic lobes show pigment-dispersing hormone-like immunoreactivity. Additionally, in most species, the tritocerebrum exhibits weak immunoreactive staining originating from ascending fibers, tritocerebral cells, or neurons in the inferior protocerebrum. Two of the three cell groups in the optic lobe have somata at the dorsal and ventral posterior edge of the lamina. These neurons have dense ramifications in the lamina with processes extending into the first optic chiasma and into distal layers of the medulla. Pigment-dispersing hormone-immunoreactive neurons of the third group have somata near the anterior proximal margin of the medulla. These neurons were reconstructed in Schistocerca gregaria, Locusta migratoria, Teleogryllus commodus, Periplaneta americana, and Extatosoma tiaratum. The neurons have wide and divergent arborizations in the medulla, in the lamina, and in several regions of the midbrain, including the superior and inferior lateral protocerebrum and areas between the pedunculi and α-lobes of the mushroom bodies. Species-specific differences were found in this third cell group with regard to the number of immunoreactive cells, midbrain arborizations, and contralateral projections, which are especially prominent in the cockroach and virtually absent in crickets. The unusual branching patterns and the special neurochemical phenotype suggest a particular physiological role of these neurons. Their possible function as circadian pacemakers is discussed.

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Authors and Affiliations

  1. Fakultät für Biologie der Universität, Postfach 5560, W-7750, Konstanz 1, Federal Republic of Germany

    U. Homberg & S. Würden

  2. Institut für Zoophysiologie der Universität, Endenicher Allee 11-13, W-5300, Bonn, Federal Republic of Germany

    H. Dircksen

  3. Department of Biology, University of West Florida, 32514, Pensacola, FL, USA

    K. R. Rao

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  1. U. Homberg
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  4. K. R. Rao
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Homberg, U., Würden, S., Dircksen, H. et al. Comparative anatomy of pigment-dispersing hormone-immunoreactive neurons in the brain of orthopteroid insects. Cell Tissue Res 266, 343–357 (1991). https://doi.org/10.1007/BF00318190

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