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Ontogeny of somatostatin-immunoreactive systems in the brain of the brown trout (Teleostei)

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Abstract

The development of somatostatin-immunoreactive neurons and fibres was studied, using immunocytochemistry, in the brain of the brown trout. Somatostatinergic perikarya were found in many regions including several telencephalic areas, the preoptic nucleus, anterior tuberal and lateral tuberal nuclei, the lateral recess nucleus, dorsal tuberal nucleus, the pre- and pseudoglomerular nuclei, central thalamic nucleus, optic tectum, interpeduncular nucleus, several isthmal and reticular nuclei and the solitary fascicle nucleus. The ventrolateral area of the telencephalon and the nucleus lateralis tuberis are the first immunoreactive nuclei to appear in ontogeny, and cells of some telencephalic areas and of the lateral optic recess nucleus, the latest. Somatostatin-immunoreactive fibre tracts innervate the hypophysis and different regions of the brain. The most richly innervated areas in adults are the dorsolateral telencephalic area and the organon vasculosum laminae terminalis. Two patterns of production of somatostatinergic cells were observed: that of populations in which cell numbers increase over the lifetime of the fish, and that of populations whose cell number is established early in development or even diminishes in adulthood. These results provide interesting contrasts to those previously reported in birds and mammals.

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Becerra, M., Manso, M.J., Rodríguez-Moldes, I. et al. Ontogeny of somatostatin-immunoreactive systems in the brain of the brown trout (Teleostei). Anat Embryol 191, 119–137 (1995). https://doi.org/10.1007/BF00186784

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