Embriologia Del OJO Carlos Gonzales Medina UNMSM
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Carlos Alejandro Gonzales MedinaCátedra de Embriología y Genética UNMSM
Lima –Peru Facultad de Medicina San Fernando
EMBRIOLOGIA HUMANA
EMBRIOGÉNESIS DEL OJO
UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS
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Contenido
1. Desarrollo embrionario de las estructuras del ojo.
2. Regulación molecular del desarrollo del ojo.
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1. ORGANOGENESIS
SEÑALES INDUCTORAS
Neuroectodermo del prosencéfalo
Ectodermo de la superficie de la cabeza
Mesodermo situado entre ambas capas
Células de la cresta neural
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Los surcos ópticos forman los tallos ópticos y las vesículas ópticas.
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Córnea
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La córnea consiste en una capa epitelial externa derivada del ectodermo superficial y capa interna derivada de las células de las crestas neurales.
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RETINA
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SECUENCIA DEL DESARROLLO DE LAS CAPAS DE LA RETINA
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Al formarse la retina, la capa pigmentada llega a ser relativamente más delgada mientras que la porción nerviosa mas gruesa.
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ORGANIZACIÓN DEL CRISTALINO
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CRISTALINO
Expresión de genes
SOX
Maf oncogen
Transformación a células alargadas con proteínas cristalinas
Alfa
Beta
Gamma
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La membrana pupilar debe regresionar, pero puede persistir después del nacimiento,
apareciendo como en el diagrama.
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Plegamiento de las capas (pigmentada y nerviosa)
resulta la formación de los procesos ciliares.
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IRIS Y CUERPO CILIAR
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ARTERIA HIALOIDEA
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Al final del período embrionario, los
párpados comienzan a formarse.
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Los párpados se hallan fusionados al principio del 2do trimestre y se abren al principio del 3er trimestre.
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2 .REGULACIÓN MOLECULAR
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2 .REGULACIÓN MOLECULAR
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REGULACIÓN MOLECULAR
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REGULACIÓN MOLECULAR
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REGULACIÓN MOLECULAR
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REGULACIÓN MOLECULAR
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REGULACIÓN MOLECULAR
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REGULACIÓN MOLECULAR
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REGULACIÓN MOLECULAR
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• Ey a (eyes absent) y Six (sinoux iculis) identificados en 2003.
• Genes Eya 1 y Eya 2 son expresados por la placoda del cristalino.
REGULACIÓN MOLECULAR
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• Anoftalmia• Ciclopia• Persistencia membrana iridiopupilar• Quiste arteria hialoidea• Afaquia• Aniridia• Catarata congénita• Coloboma
PATOLOGÍAS DEL DESARROLLO
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