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Previous issue date: 2009-10-29 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The thalamus plays an important role in the sensorial processing information, in this particular case, the visual information. Several neuronal groups have been characterized as conductors and processors of important sensorial information to the cerebral cortex. The lateral geniculate complex is one to them, and appears as a group very studied once it is responsible, in almost all totality, for the processing of visual information.
Among the nuclei that constitute the lateral geniculate complex we highlight the dorsal lateral geniculate nucleus of the thalamus (DLG), the main thalamic relay for the visual information. This nucleus is located rostral and lateral to medial geniculate nucleus and ventral to thalamic pulvinar nucleus in most of the mammals. In the primates humans and non-humans, it presents as a laminate structure, arranged in layers, when observed in coronal sections. The objective of this work was to do a mapping of the retinal projections and a citoarchictetonic and neurochemical characterization of DLG in the marmoset (Callithrix jacchus), a New World primate. The retinal projections were traced by anterograde transport of subunit b of cholera toxin (CTb), the citoarchicteture was described by Nissl method, and to neurochemical characterization immunohistochemicals technical were used to examine the main neurotransmitters and neuroatives substances present in this neural center. In DGL of marmoset thalamus, in coronal sections labeled by Nissl method, was possible to visualize the division of this nucleus in four layers divided in two portions: magnocellular and parvocellular. The retinal projections were present being visualized fibers and terminals immunorreactives to CTb (IR-CTb) in the DLG ipsilateral and contralateral. And through the immunohistochemicals techniques was observed that DLG contain cells, fibers and/or terminals immunoreactives against neuronal nuclear protein, subunits of AMPA 15 glutamate receptors (GluR1, GluR2/3, GluR4), choline acetyltransferase, serotonin, glutamic acid decarboxylase, binding calcium proteins (calbindin, parvalbumin and calretinin), vasopressin, vasoactive intestinal polypeptide, and an astrocyte protein, glial fibrillary acidic protein. / O t?lamo exerce um importante papel no processamento de informa??es sensoriais, em particular, a informa??o visual. V?rios grupos neuronais j? foram caracterizados como condutores e processadores de informa??es sensoriais importantes para o c?rtex cerebral. O complexo geniculado lateral ? um deles e aparece como um grupo muito estudado uma vez que ? respons?vel, em quase toda sua totalidade, pelo processamento de informa??o visual. Entre os n?cleos que constituem o complexo geniculado lateral destacamos o n?cleo geniculado lateral dorsal do t?lamo (GLD), o principal rel? tal?mico para as informa??es visuais. Este n?cleo se localiza rostral e lateral ao n?cleo geniculado medial e ventral ao n?cleo pulvinar do t?lamo na maioria dos mam?feros. Nos primatas humanos e n?o humanos, apresenta-se como uma estrutura laminar, disposto em camadas, quando observada em sec??es coronais. O objetivo neste trabalho foi fazer um mapeamento da proje??o retiniana e uma caracteriza??o citoarquitet?nica e neuroqu?mica do GLD no Callithrix jacchus (sag?i), um primata do Novo Mundo. As proje??es retinianas foram tra?adas por transporte anter?grado da subunidade B da toxina col?rica (CTb), a citoarquitetura foi descrita atrav?s do m?todo de Nissl, e para a caracteriza??o neuroqu?mica t?cnicas imunoistoqu?micas foram utilizadas para examinar os principais neurotransmissores e subst?ncias neuroativas presentes neste centro neural. No GLD do t?lamo do sag?i, nas sec??es coronais coradas pelo m?todo de Nissl, foi poss?vel visualizar a divis?o desse n?cleo em quatro camadas dividas em duas por??es: magnocelular e parvocelular. As proje??es retinianas estavam presentes visualizando-se fibras e terminais imunorreativos a CTb (CTb- IR) no GLD ipsolateral e contralateral. E atrav?s das t?cnicas imunoistoqu?micas observou-se que o GLD cont?m c?lulas, fibras e/ou terminais 13 imunorreativos a prote?na nuclear neuronal, subunidades dos receptores AMPA de glutamato (GluR1, GluR2/3, GluR4), colina acetiltransferase, serotonina, descarboxilase do ?cido glut?mico, prote?nas ligantes de c?lcio (calbindina, calretinina e parvalbumina), vasopressina, polipept?deo intestinal vasoativo, e uma prote?na astrocit?ria, prote?na ac?dica fibrilar glial.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17288 |
| Date | 29 October 2009 |
| Creators | Borda, Janaina Siqueira |
| Contributors | CPF:70317232487, http://lattes.cnpq.br/2378505945149958, Costa, Miriam Stela Maris de Oliveira, CPF:05014077404, http://lattes.cnpq.br/8424747565185682, Costa, Belmira Lara da Silveira Andrade da, CPF:19659356415, http://lattes.cnpq.br/3487590330093989, Cavalcante, Jeferson de Souza |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Psicobiologia, UFRN, BR, Estudos de Comportamento; Psicologia Fisiol?gica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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