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Psicofisiología - UNR - Cerebro (VII)

Psicofisiología - UNR - ISSN 2422-7358


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lunes, 24 de julio de 2017

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Cerebro (VII)
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Corte Horizontal del Cerebro

 

Un corte horizontal  supone que el plano de sección pasa en forma perpendicular al sagital, en forma paralela al suelo, dividiendo la masa encefálica en una porción superior y otra inferior. Notamos perfectamente la disposición externa del manto gris de la corteza, con sus pliegues. Hacia el centro notamos una imagen bien simétrica, cual dos alitas, una al lado de otra. Es el espacio de los Ventrículos Laterales, en su prolongación Frontal. Separa ambos lados una delgada lámina, el Septum Pellucidum, que parece estar colgando de una potente comisura blanca: el Cuerpo Calloso en su porción anterior. Hacia debajo del Septum Pellucidum, como cayendo en gota, vemos el Tercer Ventrículo. Limitado a cada lado por dos masas grises,  los Tálamos. Si volvemos sobre las prolongaciones Frontales, veremos que otras dos masas grises, una a cada lado, estuvieran empujando sobre ellas: se trata de los Núcleos Caudados, derecho e izquierdo. Por fuera de los Tálamos y los Caudados vemos una formación blanca, en forma de “V” abierta hacia afuera: es la Cápsula Interna, por donde baja desde el Area Motora Principal el Haz Piramidal. El Núcleo Lenticular (Putamen más Globo Pálido) forma el límite externo, lateral, de dicha Cápsula Interna. Yendo hacia lo posterior, también bilateralmente, notamos dos espacios, bien en negro pues están vacíos: son las prolongaciones Occipitales de los Ventrículos Laterales. Sobre la Cisura Interhemisférica, en su sector posterior, vemos emerger entre las regiones parieto occipitales, al Cerebelo que aparece en el corte como “metido” entre los hemisferios cerebrales. Finalmente, ahora desplazándonos hacia el nivel medio de la imagen, a ambos lados, vemos el repliegue cortical característico de la Cisura de Silvio, con las Insulas de cada lado.  

Image
Corte Horizontal del Cerebro
 
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