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Localization of monoamines in the forebrain of two salmonid species, with special reference to the hypothalamo-hypophysial system

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Summary

In the salmon and trout aminergic cell bodies were found in the nucleus recessus lateraralis (NRL) and the nucleus recessus posterioris (NRP), both of which are situated near the third ventricle. Three cell types could be distinguished. Type 1 produces a green and type 2 a yellow fluorescence. The former type probably contains dopamine and the latter 5-hydroxytryptamine. Both types possess intraventricular protrusions in contact with the cerebrospinal fluid. The third cell type produces a less intense blue-green fluorescence; relatively few cells of this type have thick processes in contact with the ventricle. In addition, large fluorescent cells were found in the salmon, dorsal from the caudal part of the NRL. The various parts of the NRL and NRP are interconnected by thick bundles of nerve fibers; tracts leaving the nuclei could be traced for short distances only. The cells of the nucleus praeopticus (NPO), those of the medial part and to a much lesser extent also of the lateral part of the nucleus lateralis tuberis (NLT) have an aminergic innervation which probably originates from the NRL and/or NRP. All parts of the neurohypophysis contain many monoaminergic fibers, with aminergic material concentrated at the neuro-adenohypophysial interface. Fibers were not observed to penetrate the basal lamina. In the salmon and trout the fibers have a similar distribution, but differ in the intensity of fluorescence, being high in the salmon and low in the trout. Only in the trout have fluorescent cells been found in the adenohypophysis and very occasionally in the neurohypophysis. A number of these cells are basophilic and show a PAS-positive reaction.

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Authors and Affiliations

  1. Zoological Laboratory, State University of Utrecht, The Netherlands

    M. Terlou & K. Hiemstra

  2. Department of Zoology, University of Stockholm, Sweden

    B. Ekengren

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  1. M. Terlou
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  2. B. Ekengren
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  3. K. Hiemstra
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Terlou, M., Ekengren, B. & Hiemstra, K. Localization of monoamines in the forebrain of two salmonid species, with special reference to the hypothalamo-hypophysial system. Cell Tissue Res. 190, 417–434 (1978). https://doi.org/10.1007/BF00219556

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