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The mormyrid mesencephalon. III. Retinal projections in a weakly electric fish, Gnathonemus petersii

Identifieur interne : 000C17 ( Istex/Corpus ); précédent : 000C16; suivant : 000C18

The mormyrid mesencephalon. III. Retinal projections in a weakly electric fish, Gnathonemus petersii

Auteurs : R. Lázár ; S. Libouban ; T. Szabo

Source :

RBID : ISTEX:D0B183D43D4594302DF4B603352F7C726A5EAAE7

English descriptors

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.

Url:
DOI: 10.1002/cne.902300102

Links to Exploration step

ISTEX:D0B183D43D4594302DF4B603352F7C726A5EAAE7

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<affiliation>CNRS, Laboratoire de Physiologie Nerveuse, Département de Neurophysiologie Sensorielle, 91190 Gif sur Yvette, France</affiliation>
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<dateIssued encoding="w3cdtf">1984-11-20</dateIssued>
<dateValid encoding="w3cdtf">1984-04-13</dateValid>
<copyrightDate encoding="w3cdtf">1984</copyrightDate>
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<languageTerm type="code" authority="iso639-2b">eng</languageTerm>
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<abstract lang="en">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.</abstract>
<subject lang="en">
<genre>keywords</genre>
<topic>visual system</topic>
<topic>electric fish</topic>
<topic>degeneration</topic>
<topic>tracing techniques</topic>
</subject>
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<title>Journal of Comparative Neurology</title>
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<title>J. Comp. Neurol.</title>
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<topic>Article</topic>
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<identifier type="ISSN">0021-9967</identifier>
<identifier type="eISSN">1096-9861</identifier>
<identifier type="DOI">10.1002/(ISSN)1096-9861</identifier>
<identifier type="PublisherID">CNE</identifier>
<part>
<date>1984</date>
<detail type="volume">
<caption>vol.</caption>
<number>230</number>
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<detail type="issue">
<caption>no.</caption>
<number>1</number>
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<extent unit="pages">
<start>1</start>
<end>12</end>
<total>12</total>
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<identifier type="DOI">10.1002/cne.902300102</identifier>
<identifier type="ArticleID">CNE902300102</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Copyright © 1984 Alan R. Liss, Inc.</accessCondition>
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   |texte=   The mormyrid mesencephalon. III. Retinal projections in a weakly electric fish, Gnathonemus petersii
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