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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Mapeamento das proje??es retinianas para o sistema ?ptico acess?rio, col?culo superior e complexo pr?-tectal do sagui (callithrix jacchus)

Borda, Janaina Siqueira 26 August 2015 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-10T00:27:39Z No. of bitstreams: 1 JanainaSiqueiraBorda_TESE.pdf: 2734621 bytes, checksum: 45160291f3ca65a355a6a3fdda9a3569 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-13T19:59:16Z (GMT) No. of bitstreams: 1 JanainaSiqueiraBorda_TESE.pdf: 2734621 bytes, checksum: 45160291f3ca65a355a6a3fdda9a3569 (MD5) / Made available in DSpace on 2016-06-13T19:59:16Z (GMT). No. of bitstreams: 1 JanainaSiqueiraBorda_TESE.pdf: 2734621 bytes, checksum: 45160291f3ca65a355a6a3fdda9a3569 (MD5) Previous issue date: 2015-08-26 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O sistema ?ptico acess?rio, o Complexo pr?-tectal, e o col?culo superior s?o importantes centros de controle de uma variedade de movimentos oculares, sendo extremamente necess?rios para a forma??o de imagem, consequentemente para a percep??o visual. O sistema ?ptico acess?rio ? constitu?do pelos n?cleos: n?cleo terminal dorsal, n?cleo terminal lateral, n?cleo terminal medial e n?cleo intersticial do fasc?culo superior posterior. Do ponto de vista funcional eles contribuem para a estabiliza??o da imagem, participando da atividade visuomotora onde todas as c?lulas do sistema respondem a movimentos lentos dos olhos e a est?mulos visuais, o que ? importante para o pr?prio funcionamento dos outros sistemas visuais. O complexo pr?-tectal compreende um conjunto de n?cleos situados na transi??o mesodiencef?lica, s?o eles: n?cleo pr?-tectal anterior, n?cleo pr?-tectal posterior, n?cleo pr?-tectal medial, n?cleo pr?-tectal olivar e o n?cleo do trato ?ptico, sendo todos recipientes de proje??o retiniana e funcionalmente est?o relacionados com a via do reflexo pupilar a luz e o nistagmo optocin?tico. O col?culo superior ? uma importante esta??o visual subcortical formado por camadas e, apresenta um papel funcional importante no controle dos movimentos dos olhos e da cabe?a em resposta a est?mulos multissensoriais. Nosso objetivo foi fazer um mapeamento das proje??es retinianas que incidem sobre o sistema ?ptico acess?rio, os n?cleos do complexo pr?-tectal e os do col?culo superior, buscando principalmente, no caso do complexo pr?-tectal, uma melhor delimita??o dessas estruturas, por meio do rastreamento anter?grado com a subunidade B da toxina col?rica (CTb) seguido de t?cnica imunoistoqu?mica e, caracterizar (medir ?rea e di?metro) os bot?es sin?pticos presentes nas fibras/terminais dos n?cleos do complexo pr?-tectal. Em nossos resultados o sistema ?ptico acess?rio, incluindo uma regi?o que parece ser o n?cleo terminal medial, e o col?culo superior apresentaram-se fortemente marcados por fibras/terminais imunorreativos a CTb, bem como o complexo pr?-tectal nos n?cleos: n?cleo trato ?ptico, n?cleo pr?-tectal olivar, n?cleo pr?-tectal anterior e n?cleo pr?-tectal posterior. De acordo com a caracteriza??o dos bot?es foi poss?vel fazer uma melhor delimita??o desses n?cleos. / The accessory optical system, the pretectal complex, and superior colliculus are important control centers in a variety of eye movement, being extremely necessary for image formation, consequently to visual perception. The accessory optical system is constituted by the nuclei: dorsal terminal nucleus, lateral terminal nucleus, medial terminal nucleus and interstitial nucleus of the posterior superior fasciculus. From a functional point of view they contribute to the image stabilization, participating in the visuomotor activity where all system cells respond to slow eye movements and visual stimuli, which is important for the proper functioning of other visual systems. The pretectal complex comprises a group of nuclei situated in mesodiencephalic transition, they are: anterior pretectal nucleus, posterior pretectal nucleus, medial pretectal nucleus, olivary pretectal nucleus and the nucleus of the optic tract, all retinal projection recipients and functionally are related to the route of the pupillary light reflex and the optokinetic nystagmus. The superior colliculus is an important subcortical visual station formed by layers and has an important functional role in the control of eye movements and head in response to multisensory stimuli. Our aim was to make a mapping of retinal projections that focus on accessory optical system, the nuclei of pretectal complex and the superior colliculus, searching mainly for pretectal complex, better delineation of these structures through the anterograde tracing with the B subunit of cholera toxin (CTb) followed by immunohistochemistry and characterized (measured diameter) synaptic buttons present on the fibers / terminals of the nucleus complex pr?-tectal. In our results accessory optical system, including a region which appears to be medial terminal nucleus and superior colliculus, were strongly marked by fibers / terminals immunoreactive CTb as well as pretectal complex in the nucleus: optic tract, olivary pretectal nucleus, anterior pretectal nucleus and posterior pretectal nucleus. According to the characterization of the buttons it was possible to make a better definition of these nucleus.

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