Visual projections in larval Ichthyophis kohtaoensis (Amphibia: gymnophiona)
Identifieur interne : 001253 ( Istex/Corpus ); précédent : 001252; suivant : 001254Visual projections in larval Ichthyophis kohtaoensis (Amphibia: gymnophiona)
Auteurs : Bernd Fritzsch ; W. Himstedt ; M. D. Crapon De CapronaSource :
- Developmental Brain Research [ 0165-3806 ] ; 1985.
Abstract
The visual projection patterns of retinal efferents were studied in larval Ichthyophis kohtaoensis by means of anterogradely transported HRP. Our results show in all larvae a projection contralateral to a thalamic terminal field, a pretectal terminal field, and a basal optic neuropil, but only a sparse innervation of the contralateral tectum. In addition, all larvae possess an uncrossed projection to a thalamic and a pretectal terminal field. The fibers are bilaterally almost confined to the medial optic tract with only a few fibers running in the marginal and basal optic tract. The ipsilateral and contralateral tracts and terminal fields seem to enlarge during larval life. Comparison with other amphibian orders reveals that larval Ichthyophis are unique in that they develop the medial optic tract and the related thalamic and pretectal terminal fields very early in larval life. In addition they possess only a very sparse tectal projection, though it is the largest projection in larval urodeles and anurans. This suggests a selective phylogenetic loss of those ganglion cells or collaterals which project mainly to the tectum in other amphibian orders and a change in the ontogenetic program leading to an earlier development of the medial optic tract in Ichthyophis as compared to urodeles and anurans.
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DOI: 10.1016/0165-3806(85)90042-2
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Visual projections in larval Ichthyophis kohtaoensis (Amphibia: gymnophiona)</title><author><name sortKey="Fritzsch, Bernd" sort="Fritzsch, Bernd" uniqKey="Fritzsch B" first="Bernd" last="Fritzsch">Bernd Fritzsch</name><affiliation><mods:affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</mods:affiliation></affiliation></author><author><name sortKey="Himstedt, W" sort="Himstedt, W" uniqKey="Himstedt W" first="W." last="Himstedt">W. Himstedt</name><affiliation><mods:affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</mods:affiliation></affiliation></author><author><name sortKey="Crapon De Caprona, M D" sort="Crapon De Caprona, M D" uniqKey="Crapon De Caprona M" first="M. D." last="Crapon De Caprona">M. D. Crapon De Caprona</name><affiliation><mods:affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:82233F2635219D2A7FB7927C444D523E74D51C94</idno><date when="1985" year="1985">1985</date><idno type="doi">10.1016/0165-3806(85)90042-2</idno><idno type="url">https://api.istex.fr/document/82233F2635219D2A7FB7927C444D523E74D51C94/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001253</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001253</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Visual projections in larval Ichthyophis kohtaoensis (Amphibia: gymnophiona)</title><author><name sortKey="Fritzsch, Bernd" sort="Fritzsch, Bernd" uniqKey="Fritzsch B" first="Bernd" last="Fritzsch">Bernd Fritzsch</name><affiliation><mods:affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</mods:affiliation></affiliation></author><author><name sortKey="Himstedt, W" sort="Himstedt, W" uniqKey="Himstedt W" first="W." last="Himstedt">W. Himstedt</name><affiliation><mods:affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</mods:affiliation></affiliation></author><author><name sortKey="Crapon De Caprona, M D" sort="Crapon De Caprona, M D" uniqKey="Crapon De Caprona M" first="M. D." last="Crapon De Caprona">M. D. Crapon De Caprona</name><affiliation><mods:affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Developmental Brain Research</title><title level="j" type="abbrev">BRESD</title><idno type="ISSN">0165-3806</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1985">1985</date><biblScope unit="volume">23</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="201">201</biblScope><biblScope unit="page" to="210">210</biblScope></imprint><idno type="ISSN">0165-3806</idno></series><idno type="istex">82233F2635219D2A7FB7927C444D523E74D51C94</idno><idno type="DOI">10.1016/0165-3806(85)90042-2</idno><idno type="PII">0165-3806(85)90042-2</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0165-3806</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The visual projection patterns of retinal efferents were studied in larval Ichthyophis kohtaoensis by means of anterogradely transported HRP. Our results show in all larvae a projection contralateral to a thalamic terminal field, a pretectal terminal field, and a basal optic neuropil, but only a sparse innervation of the contralateral tectum. In addition, all larvae possess an uncrossed projection to a thalamic and a pretectal terminal field. The fibers are bilaterally almost confined to the medial optic tract with only a few fibers running in the marginal and basal optic tract. The ipsilateral and contralateral tracts and terminal fields seem to enlarge during larval life. Comparison with other amphibian orders reveals that larval Ichthyophis are unique in that they develop the medial optic tract and the related thalamic and pretectal terminal fields very early in larval life. In addition they possess only a very sparse tectal projection, though it is the largest projection in larval urodeles and anurans. This suggests a selective phylogenetic loss of those ganglion cells or collaterals which project mainly to the tectum in other amphibian orders and a change in the ontogenetic program leading to an earlier development of the medial optic tract in Ichthyophis as compared to urodeles and anurans.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>Bernd Fritzsch</name><affiliations><json:string>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</json:string></affiliations></json:item><json:item><name>W. Himstedt</name><affiliations><json:string>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</json:string></affiliations></json:item><json:item><name>M.D. Crapon de Caprona</name><affiliations><json:string>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>gymnophiona</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>larval visual projection</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>ipsilateral visual projection</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>amphibia</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>BON : basal optic neuropil</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>BOT : basal optic tract</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>dt : dorsal thalamus</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>e : epiphysis</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>fr : fasciculus retroflexus</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>h : habenula</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>hc : habenuclar commisure</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>MaOT : marginal optic tract</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>MeOT : medial optic tract</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>np : nucleus preopticus</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>n III : nucleus oculomotorius</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>nIV : nucleus trochlearis</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>pc : posterior commissure</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>PN : pretectal neuropil</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>pt : pretectum</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>sh : sulcus hypothalamicus</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>sm : sulcus medialis</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>tel : telencephalon</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>tm : tegmentum</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>TN : thalamic neuropil</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>to : tectom opticum</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>vt : ventral thalamus</value></json:item></subject><language><json:string>eng</json:string></language><originalGenre><json:string>Short communication</json:string></originalGenre><abstract>The visual projection patterns of retinal efferents were studied in larval Ichthyophis kohtaoensis by means of anterogradely transported HRP. Our results show in all larvae a projection contralateral to a thalamic terminal field, a pretectal terminal field, and a basal optic neuropil, but only a sparse innervation of the contralateral tectum. In addition, all larvae possess an uncrossed projection to a thalamic and a pretectal terminal field. The fibers are bilaterally almost confined to the medial optic tract with only a few fibers running in the marginal and basal optic tract. The ipsilateral and contralateral tracts and terminal fields seem to enlarge during larval life. Comparison with other amphibian orders reveals that larval Ichthyophis are unique in that they develop the medial optic tract and the related thalamic and pretectal terminal fields very early in larval life. In addition they possess only a very sparse tectal projection, though it is the largest projection in larval urodeles and anurans. This suggests a selective phylogenetic loss of those ganglion cells or collaterals which project mainly to the tectum in other amphibian orders and a change in the ontogenetic program leading to an earlier development of the medial optic tract in Ichthyophis as compared to urodeles and anurans.</abstract><qualityIndicators><score>7.96</score><pdfVersion>1.4</pdfVersion><pdfPageSize>504 x 742 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>26</keywordCount><abstractCharCount>1317</abstractCharCount><pdfWordCount>5819</pdfWordCount><pdfCharCount>33956</pdfCharCount><pdfPageCount>10</pdfPageCount><abstractWordCount>205</abstractWordCount></qualityIndicators><title>Visual projections in larval Ichthyophis kohtaoensis (Amphibia: gymnophiona)</title><pii><json:string>0165-3806(85)90042-2</json:string></pii><genre><json:string>brief-communication</json:string></genre><serie><volume>81</volume><pages><last>5593</last><first>5589</first></pages><language><json:string>unknown</json:string></language><title>Proc. Natl. Acad. Sci. U.S.A.</title></serie><host><volume>23</volume><pii><json:string>S0165-3806(00)X0097-1</json:string></pii><pages><last>210</last><first>201</first></pages><issn><json:string>0165-3806</json:string></issn><issue>2</issue><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><title>Developmental Brain Research</title><publicationDate>1985</publicationDate></host><categories><wos></wos><scienceMetrix><json:string>health sciences</json:string><json:string>clinical medicine</json:string><json:string>neurology & neurosurgery</json:string></scienceMetrix></categories><publicationDate>1985</publicationDate><copyrightDate>1985</copyrightDate><doi><json:string>10.1016/0165-3806(85)90042-2</json:string></doi><id>82233F2635219D2A7FB7927C444D523E74D51C94</id><score>0.024017438</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/82233F2635219D2A7FB7927C444D523E74D51C94/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/82233F2635219D2A7FB7927C444D523E74D51C94/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/82233F2635219D2A7FB7927C444D523E74D51C94/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a">Visual projections in larval Ichthyophis kohtaoensis (Amphibia: gymnophiona)</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>ELSEVIER</p></availability><date>1985</date></publicationStmt><notesStmt><note type="content">Section title: Research report</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Visual projections in larval Ichthyophis kohtaoensis (Amphibia: gymnophiona)</title><author xml:id="author-1"><persName><forename type="first">Bernd</forename><surname>Fritzsch</surname></persName><note type="correspondence"><p>Correspondence: B. Fritzsch, University of Bielefeld, Faculty of Biology, Postbox 8642, 4800 Bielefeld 1, F.R.G.</p></note><affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</affiliation></author><author xml:id="author-2"><persName><forename type="first">W.</forename><surname>Himstedt</surname></persName><affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</affiliation></author><author xml:id="author-3"><persName><forename type="first">M.D.</forename><surname>Crapon de Caprona</surname></persName><affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</affiliation></author></analytic><monogr><title level="j">Developmental Brain Research</title><title level="j" type="abbrev">BRESD</title><idno type="pISSN">0165-3806</idno><idno type="PII">S0165-3806(00)X0097-1</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1985"></date><biblScope unit="volume">23</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="201">201</biblScope><biblScope unit="page" to="210">210</biblScope></imprint></monogr><idno type="istex">82233F2635219D2A7FB7927C444D523E74D51C94</idno><idno type="DOI">10.1016/0165-3806(85)90042-2</idno><idno type="PII">0165-3806(85)90042-2</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1985</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>The visual projection patterns of retinal efferents were studied in larval Ichthyophis kohtaoensis by means of anterogradely transported HRP. Our results show in all larvae a projection contralateral to a thalamic terminal field, a pretectal terminal field, and a basal optic neuropil, but only a sparse innervation of the contralateral tectum. In addition, all larvae possess an uncrossed projection to a thalamic and a pretectal terminal field. The fibers are bilaterally almost confined to the medial optic tract with only a few fibers running in the marginal and basal optic tract. The ipsilateral and contralateral tracts and terminal fields seem to enlarge during larval life. Comparison with other amphibian orders reveals that larval Ichthyophis are unique in that they develop the medial optic tract and the related thalamic and pretectal terminal fields very early in larval life. In addition they possess only a very sparse tectal projection, though it is the largest projection in larval urodeles and anurans. This suggests a selective phylogenetic loss of those ganglion cells or collaterals which project mainly to the tectum in other amphibian orders and a change in the ontogenetic program leading to an earlier development of the medial optic tract in Ichthyophis as compared to urodeles and anurans.</p></abstract><textClass><keywords scheme="keyword"><list><head>Keywords</head><item><term>gymnophiona</term></item><item><term>larval visual projection</term></item><item><term>ipsilateral visual projection</term></item><item><term>amphibia</term></item></list></keywords></textClass><textClass><keywords scheme="keyword"><list><head>Abbreviations</head><item><term>BON</term><term>basal optic neuropil</term></item><item><term>BOT</term><term>basal optic tract</term></item><item><term>dt</term><term>dorsal thalamus</term></item><item><term>e</term><term>epiphysis</term></item><item><term>fr</term><term>fasciculus retroflexus</term></item><item><term>h</term><term>habenula</term></item><item><term>hc</term><term>habenuclar commisure</term></item><item><term>MaOT</term><term>marginal optic tract</term></item><item><term>MeOT</term><term>medial optic tract</term></item><item><term>np</term><term>nucleus preopticus</term></item><item><term>n III</term><term>nucleus oculomotorius</term></item><item><term>nIV</term><term>nucleus trochlearis</term></item><item><term>pc</term><term>posterior commissure</term></item><item><term>PN</term><term>pretectal neuropil</term></item><item><term>pt</term><term>pretectum</term></item><item><term>sh</term><term>sulcus hypothalamicus</term></item><item><term>sm</term><term>sulcus medialis</term></item><item><term>tel</term><term>telencephalon</term></item><item><term>tm</term><term>tegmentum</term></item><item><term>TN</term><term>thalamic neuropil</term></item><item><term>to</term><term>tectom opticum</term></item><item><term>vt</term><term>ventral thalamus</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1985">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/82233F2635219D2A7FB7927C444D523E74D51C94/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="sco"><item-info><jid>BRESD</jid><aid>85900422</aid><ce:pii>0165-3806(85)90042-2</ce:pii><ce:doi>10.1016/0165-3806(85)90042-2</ce:doi><ce:copyright type="unknown" year="1985"></ce:copyright></item-info><head><ce:dochead><ce:textfn>Research report</ce:textfn></ce:dochead><ce:title>Visual projections in larval <ce:italic>Ichthyophis kohtaoensis</ce:italic> (Amphibia: gymnophiona)</ce:title><ce:author-group><ce:author><ce:given-name>Bernd</ce:given-name><ce:surname>Fritzsch</ce:surname><ce:cross-ref refid="COR1"><ce:sup>∗</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>W.</ce:given-name><ce:surname>Himstedt</ce:surname></ce:author><ce:author><ce:given-name>M.D.</ce:given-name><ce:surname>Crapon de Caprona</ce:surname></ce:author><ce:affiliation><ce:textfn>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</ce:textfn></ce:affiliation><ce:correspondence id="COR1"><ce:label>∗</ce:label><ce:text>Correspondence: B. Fritzsch, University of Bielefeld, Faculty of Biology, Postbox 8642, 4800 Bielefeld 1, F.R.G.</ce:text></ce:correspondence></ce:author-group><ce:date-accepted day="14" month="5" year="1985"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>The visual projection patterns of retinal efferents were studied in larval <ce:italic>Ichthyophis kohtaoensis</ce:italic> by means of anterogradely transported HRP. Our results show in all larvae a projection contralateral to a thalamic terminal field, a pretectal terminal field, and a basal optic neuropil, but only a sparse innervation of the contralateral tectum. In addition, all larvae possess an uncrossed projection to a thalamic and a pretectal terminal field. The fibers are bilaterally almost confined to the medial optic tract with only a few fibers running in the marginal and basal optic tract. The ipsilateral and contralateral tracts and terminal fields seem to enlarge during larval life. Comparison with other amphibian orders reveals that larval <ce:italic>Ichthyophis</ce:italic> are unique in that they develop the medial optic tract and the related thalamic and pretectal terminal fields very early in larval life. In addition they possess only a very sparse tectal projection, though it is the largest projection in larval urodeles and anurans. This suggests a selective phylogenetic loss of those ganglion cells or collaterals which project mainly to the tectum in other amphibian orders and a change in the ontogenetic program leading to an earlier development of the medial optic tract in <ce:italic>Ichthyophis</ce:italic> as compared to urodeles and anurans.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:keywords><ce:section-title>Keywords</ce:section-title><ce:keyword><ce:text>gymnophiona</ce:text></ce:keyword><ce:keyword><ce:text>larval visual projection</ce:text></ce:keyword><ce:keyword><ce:text>ipsilateral visual projection</ce:text></ce:keyword><ce:keyword><ce:text>amphibia</ce:text></ce:keyword></ce:keywords><ce:keywords class="abr"><ce:section-title>Abbreviations</ce:section-title><ce:keyword><ce:text>BON</ce:text><ce:keyword><ce:text>basal optic neuropil</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>BOT</ce:text><ce:keyword><ce:text>basal optic tract</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>dt</ce:text><ce:keyword><ce:text>dorsal thalamus</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>e</ce:text><ce:keyword><ce:text>epiphysis</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>fr</ce:text><ce:keyword><ce:text>fasciculus retroflexus</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>h</ce:text><ce:keyword><ce:text>habenula</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>hc</ce:text><ce:keyword><ce:text>habenuclar commisure</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>MaOT</ce:text><ce:keyword><ce:text>marginal optic tract</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>MeOT</ce:text><ce:keyword><ce:text>medial optic tract</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>np</ce:text><ce:keyword><ce:text>nucleus preopticus</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>n III</ce:text><ce:keyword><ce:text>nucleus oculomotorius</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>nIV</ce:text><ce:keyword><ce:text>nucleus trochlearis</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>pc</ce:text><ce:keyword><ce:text>posterior commissure</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>PN</ce:text><ce:keyword><ce:text>pretectal neuropil</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>pt</ce:text><ce:keyword><ce:text>pretectum</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>sh</ce:text><ce:keyword><ce:text>sulcus hypothalamicus</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>sm</ce:text><ce:keyword><ce:text>sulcus medialis</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>tel</ce:text><ce:keyword><ce:text>telencephalon</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>tm</ce:text><ce:keyword><ce:text>tegmentum</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>TN</ce:text><ce:keyword><ce:text>thalamic neuropil</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>to</ce:text><ce:keyword><ce:text>tectom opticum</ce:text></ce:keyword></ce:keyword><ce:keyword><ce:text>vt</ce:text><ce:keyword><ce:text>ventral thalamus</ce:text></ce:keyword></ce:keyword></ce:keywords></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Visual projections in larval Ichthyophis kohtaoensis (Amphibia: gymnophiona)</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Visual projections in larval</title></titleInfo><name type="personal"><namePart type="given">Bernd</namePart><namePart type="family">Fritzsch</namePart><affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</affiliation><description>Correspondence: B. Fritzsch, University of Bielefeld, Faculty of Biology, Postbox 8642, 4800 Bielefeld 1, F.R.G.</description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">W.</namePart><namePart type="family">Himstedt</namePart><affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M.D.</namePart><namePart type="family">Crapon de Caprona</namePart><affiliation>University of Bielefeld, Bielefeld and Technische Hochschule, Darmstadt F.R.G.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="brief-communication" displayLabel="Short communication"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1985</dateIssued><copyrightDate encoding="w3cdtf">1985</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">The visual projection patterns of retinal efferents were studied in larval Ichthyophis kohtaoensis by means of anterogradely transported HRP. Our results show in all larvae a projection contralateral to a thalamic terminal field, a pretectal terminal field, and a basal optic neuropil, but only a sparse innervation of the contralateral tectum. In addition, all larvae possess an uncrossed projection to a thalamic and a pretectal terminal field. The fibers are bilaterally almost confined to the medial optic tract with only a few fibers running in the marginal and basal optic tract. The ipsilateral and contralateral tracts and terminal fields seem to enlarge during larval life. Comparison with other amphibian orders reveals that larval Ichthyophis are unique in that they develop the medial optic tract and the related thalamic and pretectal terminal fields very early in larval life. In addition they possess only a very sparse tectal projection, though it is the largest projection in larval urodeles and anurans. This suggests a selective phylogenetic loss of those ganglion cells or collaterals which project mainly to the tectum in other amphibian orders and a change in the ontogenetic program leading to an earlier development of the medial optic tract in Ichthyophis as compared to urodeles and anurans.</abstract><note type="content">Section title: Research report</note><subject><genre>Keywords</genre><topic>gymnophiona</topic><topic>larval visual projection</topic><topic>ipsilateral visual projection</topic><topic>amphibia</topic></subject><subject><genre>Abbreviations</genre><topic>BON : basal optic neuropil</topic><topic>BOT : basal optic tract</topic><topic>dt : dorsal thalamus</topic><topic>e : epiphysis</topic><topic>fr : fasciculus retroflexus</topic><topic>h : habenula</topic><topic>hc : habenuclar commisure</topic><topic>MaOT : marginal optic tract</topic><topic>MeOT : medial optic tract</topic><topic>np : nucleus preopticus</topic><topic>n III : nucleus oculomotorius</topic><topic>nIV : nucleus trochlearis</topic><topic>pc : posterior commissure</topic><topic>PN : pretectal neuropil</topic><topic>pt : pretectum</topic><topic>sh : sulcus hypothalamicus</topic><topic>sm : sulcus medialis</topic><topic>tel : telencephalon</topic><topic>tm : tegmentum</topic><topic>TN : thalamic neuropil</topic><topic>to : tectom opticum</topic><topic>vt : ventral thalamus</topic></subject><relatedItem type="host"><titleInfo><title>Developmental Brain Research</title></titleInfo><titleInfo type="abbreviated"><title>BRESD</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">198512</dateIssued></originInfo><identifier type="ISSN">0165-3806</identifier><identifier type="PII">S0165-3806(00)X0097-1</identifier><part><date>198512</date><detail type="volume"><number>23</number><caption>vol.</caption></detail><detail type="issue"><number>2</number><caption>no.</caption></detail><extent unit="issue pages"><start>161</start><end>321</end></extent><extent unit="pages"><start>201</start><end>210</end></extent></part></relatedItem><identifier type="istex">82233F2635219D2A7FB7927C444D523E74D51C94</identifier><identifier type="DOI">10.1016/0165-3806(85)90042-2</identifier><identifier type="PII">0165-3806(85)90042-2</identifier><recordInfo><recordContentSource>ELSEVIER</recordContentSource></recordInfo></mods></metadata></istex></record>Pour manipuler ce document sous Unix (Dilib)
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