clases anatomia cerebro (2)
TRANSCRIPT
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CEREBRO
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MASA PRINCIPAL DEL ENCEFALO
SOSTENIDO POR EL DIENCEFALO Y EL TRONCO
ENCEFALICO
CONFORMADO POR UNA SUSTANCIA GRIS DE 2 A 4
mm DE GROSOR(CORTEZA CEREBRAL)
DURANTE ELDESARROLLO LA SUSTANCIA GRIS CRECE MAS RAPIDO QUE LA SUSTANCIA
BLANCA, POR LO QUE FORMA PLIGUES (GRIROS)
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CEREBRO
UBICACION
FOSA ANTERIOR
FOSA MEDIA, PORCIONES LATERALES
ESPACIO SUPRATENTORIAL
DIVISION INTERNA
CORTEZA
SUSTANCIA BLANCA
GANGLIOS BASALES
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DURAMADRE:DOS CAPAS PERIOSTALMENINGEA
ARACNOIDES:NO SE PUEDE RESECAR
INTIMAMENTE ADOSADA A LA DURAMADRE
PIAMADRE:VASCULARIZADA
MENINGES
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MORFOLOGIA CORTICAL EXTERNA
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PRESENTA REPLIEGUESPARA AUMENTAR EL VOLUMEN CORTICAL
FISURAS: SURCOS PROFUNDOS DAN
ORIGEN A LOS LOBULOS
SURCOS: DAN ORIGEN A LOS GIROS O
CIRCONVOLUCIONES
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• Surcos-----giros o circunvoluciones
• Fisuras------- lóbulos
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ESTOS SURCOS SON LOS LIMITES DELOS LOBULOS
SURCO CENTRAL (DE ROLANDO)
SURCO LATERAL (DE SILVIO)
SURCO PARIETOOCCIPITAL
SURCO CALCARINO
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LOBULOS CEREBRALES
FRONTAL: FOSA CRANEAL
ANTERIOR. ANTERIOR AL
SURCO CENTRAL Y SUPERIOR AL
SURCO LATERAL
PARIETAL: HUESO PARIETAL.
POSTERIOR AL SURCO CENTRAL,
SUPERIOR AL SURCO LATERAL Y
ANTERIOR AL SURCO PARIETO
OCCIPITAL
OCCIPITAL: ESCAMA DEL OCCIPITAL Y TIENDA DEL CEREBELO,
POSTERIOR AL SURCO
PARIETOOCCIPITAL
TEMPORAL: FOSA MEDIA INFERIOR AL
SURCO LATERAL
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LOBULOS CEREBRALES
INSULAR: LIMITE CON LOS
GANGLIOS BASALES, BAJO EL SURCO LATERAL EN LA
PROFUNDIDAD DEL LOBULO TEMPORAL
LIMBICO: CARA MEDIAL DEL
HEMISFERIO, CIRCUNVOLUCION DEL CUERPO CALLOSO, LA
CIRCUNVOLUCION SUB-CALLOSA Y EL GIRO HIPOCAMPAL
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Fórnix o trígono cerebral
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GIROS O CIRCUNVOLUCIONES
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Circunvoluciones
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AREAS DE BRODMAN
AREA 1-2-3CORTEZA
SOMATOSENSORIAL PRIMARIA
AREA 4 CORTEZA MOTORA PRIMARIA
AREA 5-7CORTEZA DE ASOCIACION
SOMATOSENSORIAL
AREA 6 CORTEZA MOTORA SECUNDARIA
AREA 17 CORTEZA VISUAL PRIMARIA
AREA 22-32-40 AREA DE WERNICKE
AREA 41-42 CORTEZA AUDITIVA PRIMARIA
AREA 44-45 ARA DE BROCA
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Estructura Interna de los Hemisferios Cerebrales
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Núcleos Basales (Ganglios basales)
• Núcleos subcorticales, desempeñando un papel fundamental en el sistema motor
• Porciones de sustancia gris que no pertenecen a la corteza
• Se relacionan con el diencéfalo
– NUCLEO CAUDADO: rodea al talamo y presenta 3 porciones: cabeza, cuerpo y cola
– NUCLEO PUTAMEN: se separa del caudado por la cápsula interna
– GLOBO PALIDO lateral y medial– CLAUSTRO
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Funciones de los núcleos basales
• Controlar y regular los mov. voluntarios por influencia en la corteza cerebral.
• Aprendizaje de las habilidades
• Ayudan a prepararse para los movimientos.
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Sustancia blanca de los hemisferios
• Fibras Comisurales
• Fibras de asociación
• Fibras de proyección
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Sustancia blanca de los hemisferios
–Fibras Comisurales: conectan regiones de los 2 hemisferios.
–Cuerpo Calloso–Comisura Anterior–Comisura Posterior–Comisura del Fornix–Comisura Habenular
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Sustancia blanca de los hemisferios
• Fibras de asociación: conectan varias regiones corticales del mismo hemisferio
– Fibras cortas, unen circunvoluciones adyacentes
– Fibras largas, unen áreas distantes • Fascículo arciforme• Cíngulo• Fascículo Longitudinal Superior• Fascículo Longitudinal Inferior• Fascículo Frontooccipital
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Sustancia blanca de los hemisferios
• Fibras de proyección:
– Cápsula interna• Brazo anterior• Rodilla• Brazo posterior
– Corona radiada (proyección desde la cápsula interna hacía la corteza)
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Sistema Ventricular
• Ventrículos laterales– Forámen interventricular
• III Ventrículo– Acueducto cerebral
• IV Ventrículo– Orificio medio– Orificios laterales
• Plexos coroideos: LCR
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Irrigación Cerebral(polígono de Willis)
• Sistema Carotídeo– A. Oftálmica– A. Cerebral Anterior– A. Cerebral Media– A. Comunicante posterior– A. Coroidea
• Sistema vertebrobasilar– A. Cerebral Posterior
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