Reischig, Thomas and Stengl, Monika (1996) Morphology and pigment-dispersing hormone immunocytochemistry of the accessory medulla, the presumptive circadian pacemaker of the cockroach Leucophaea maderae: A light- and electron-microscopic study. CELL AND TISSUE RESEARCH, 285 (2). pp. 305-319. ISSN 0302-766X, 1432-0878
Full text not available from this repository.Abstract
To provide a framework for a cellular analysis of the accessory medulla, which is the presumptive circadian pacemaker of hemimetabolous insects, we have studied this neuropil and its associated neuronal structures by light- and electron-microscopy in the cockroach Leucophaea maderae. The accessory medulla is situated at the ventromedial edge of the medulla and shows no evidence of a retinotopical organization. Instead, it is composed of dense noduli that are embedded in internodular neuropil. The distal fiber tract, which appears to originate from the lamina and the medulla, provides a possible visual input to the accessory medulla. Electron-microscopic studies show that the accessory medulla contains accumulations of at least four types of dense-core vesicles, viz., granular, small, medium-sized, and large. Granular vesicles occur almost exclusively in processes of the nodular neuropil and are apparently confined to local neurons; the other three types are restricted to the internodular and loose neuropil that surrounds the accessory medulla. Immunostaining for light- and electron-microscopy has demonstrated that arborizations of presumptive pacemaker neurons, viz., neurons immunoreactive for the pigment-dispersing hormone, are restricted to the internodular and the loose neuropil of the accessory medulla. Immunoreactivity for pigment-dispersing hormone is found only in subpopulations of terminals containing medium-sized or large dense-core vesicles, in association with the vesicles.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CENTRAL-NERVOUS-SYSTEM; MOTH MANDUCA-SEXTA; IMMUNOREACTIVE NEURONS; EXTRAOCULAR PHOTORECEPTORS; SUPRACHIASMATIC NUCLEUS; DROSOPHILA-MELANOGASTER; OPTIC LOBES; LOCALIZATION; BRAIN; ULTRASTRUCTURE; nervous system, insect; optic lobe; neuropil; circadian rhythm; dense-core vesicles; pigment-dispersing hormone; Leucophaea maderae (Insecta) |
| Subjects: | 500 Science > 590 Zoological sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Zoologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Jun 2023 08:35 |
| Last Modified: | 29 Jun 2023 08:35 |
| URI: | https://pred.uni-regensburg.de/id/eprint/51554 |
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