The mormyrid mesencephalon. III. Retinal projections in a weakly electric fish, Gnathonemus petersii
Identifieur interne : 000C15 ( Istex/Curation ); précédent : 000C14; suivant : 000C16The mormyrid mesencephalon. III. Retinal projections in a weakly electric fish, Gnathonemus petersii
Auteurs : R. Lázár [France, Hongrie] ; S. Libouban [France] ; T. Szabo [France]Source :
- Journal of Comparative Neurology [ 0021-9967 ] ; 1984-11-20.
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Abstract
The optic nerve and the retinal projections were studied in a mormyrid fish, Gnathonemus petersii, by using Fink‐Heimer, HRP, cobalt labeling, and autoradiographic tracing techniques. The retinal fibers terminate bilaterally in the following places: suprachiasmatic nucleus, dorsolateral optic nucleus, optic nucleus of the posterior commissure, cortical nucleus, ventral pretectal area, optic tectum, and the accessory optic terminal field. The number of uncrossed fibers is relatively high in the suprachiasmatic nucleus, but negligibly small in the other retinal terminal fields. In the lateral geniculate nucleus and pretectal nucleus only crossed retinal fibers could be detected. The visual system of Gnathonemus is compared to that of other fishes, amphibians, and reptiles and the possible homologies are proposed. The comparison points to the conclusion that the visual system is less developed in Gnathonemus. This nocturnal species lives in turbid waters and has a special electric sense which may permit compensation for the reduced visual capacity.
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DOI: 10.1002/cne.902300102
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Lázár</name><affiliation wicri:level="1"><mods:affiliation>CNRS, Laboratoire de Physiologie Nerveuse, Département de Neurophysiologie Sensorielle, 91190 Gif sur Yvette, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>CNRS, Laboratoire de Physiologie Nerveuse, Département de Neurophysiologie Sensorielle, 91190 Gif sur Yvette</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Current Address: Department of Anatomy, University Medical School, Pécs, 7643, Hungary</mods:affiliation><country xml:lang="fr">Hongrie</country><wicri:regionArea>Current Address: Department of Anatomy, University Medical School, Pécs, 7643</wicri:regionArea></affiliation></author><author><name sortKey="Libouban, S" sort="Libouban, S" uniqKey="Libouban S" first="S." last="Libouban">S. 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