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    segundo órgano más grande del encéfalo sirve para mantener el equilibrio y coordinar los movimientos finos

    Santiago

    Chicos, ¿alguien sabe la respuesta?

    obtenga segundo órgano más grande del encéfalo sirve para mantener el equilibrio y coordinar los movimientos finos de este sitio.

    Tu cerebro y tu sistema nervioso (para Niños )

    ¿Cómo eres capaz de recordar el camino a la casa de un amigo tuyo? ¿Por qué parpadeas sin ni siquiera pensar en ello? ¿De dónde vienen los sueños? Tu cerebro se encarga de esas cosas y de muchas otras más.

    Tu cerebro y tu sistema nervioso

    Revisado por: Larissa Hirsch, MD

    Print in English

    Your Brain & Nervous System

    ¿Cómo eres capaz de recordar el camino a la casa de un amigo tuyo? ¿Por qué parpadeas sin ni siquiera pensar en ello? ¿De dónde vienen los sueños? Tu cerebro se encarga de esas cosas y de muchas otras más.

    De hecho, el cerebro es el jefe de tu cuerpo. Dirige el espectáculo y controla absolutamente todo lo que haces, incluso cuando estás dormido. No está nada mal para algo que parece una gran esponja gris y arrugada.

    Tu cerebro consta de muchas partes diferentes que trabajan conjuntamente. Ahora vamos a hablar sobre estas cinco partes, que son las piezas clave del equipo cerebral:

    el telencéfalo el cerebelo el tronco cerebral la hipófisis el hipotálamo

    La parte de mayor tamaño: el telencéfalo

    La parte de mayor tamaño del cerebro es el telencéfalo. El telencéfalo es la parte "pensante" del cerebro y la que controla los músculos voluntarios (los se mueven cuando tú quieres que se muevan). Por eso, necesitas el telencéfalo para bailar o para patear una pelota de fútbol.

    Necesitas el telencéfalo para resolver problemas de matemáticas, jugar a videojuegos y dibujar. Tu memoria, tanto a corto plazo (lo que comiste anoche en la cena) como a largo plazo (el nombre de la montaña rusa a la que te subiste hace dos años), reside en el telencéfalo. El telencéfalo también te ayuda a razonar, como cuando te das cuenta de que es mejor hacer los deberes ahora porque tu mamá te va a llevar a ver una película más tarde.

    El telencéfalo consta de dos mitades, una a cada lado de la cabeza. Los científicos creen que la mitad derecha ayuda a pensar en cosas abstractas, como la música, los colores y las formas. Se cree que la parte izquierda es más analítica, ayudándote en las matemáticas, la lógica y el habla. Los científicos saben con toda seguridad que la parte derecha del telencéfalo controla a la parte izquierda del cuerpo y que, respectivamente, la parte izquierda controla a la derecha.

    Los malabarismos del cerebelo

    La parte siguiente es el cerebelo. El cerebelo está en la parte posterior del cerebro, debajo del telencéfalo. Es mucho más pequeño que el telencéfalo. Pero es una parte muy importante del cerebro. Controla el equilibrio, el movimiento y la coordinación (cómo tus músculos trabajan conjuntamente).

    Gracias al cerebelo, puedes mantenerte de pie, mantener el equilibrio y moverte de un lado a otro. Piensa en un surfista montado en su tabla de surf entre las olas. ¿Qué es lo que más necesita para mantener el equilibrio? ¿La mejor tabla de surf del mundo? ¿El traje de neopreno más espectacular? No: ¡necesita su cerebelo!

    El tronco cerebral permite que sigas respirando y más cosas

    Otra parte del cerebro que es pequeña pero muy importante es el tronco o el tallo cerebral (también conocido como "tronco encefálico"). El tronco cerebral está situado debajo del telencéfalo y delante del cerebelo. Conecta el resto del cerebro a la médula espinal, que baja desde el cuello hasta el final de la espalda. El tronco cerebral se encarga de todas las funciones que tu cuerpo necesita hacer para mantenerse vivo, como respirar aire, digerir alimentos y que circule la sangre.

    Parte de la función del tronco cerebral consiste en controlar a los músculos involuntarios, los que funcionan automáticamente, sin que tengas que pensar en ello. Hay músculos involuntarios en el corazón y el estómago, y es el tronco cerebral el que le indica a tu corazón que bombee más sangre cuando montas en bicicleta o cuando tu estómago empieza a digerir la comida. El tronco cerebral también se encarga de organizar los millones de mensajes que el cerebro y el resto del cuerpo se envían mutuamente. ¡Uf! ¡Es mucho trabajo ser el secretario del cerebro!

    La hipófisis controla el crecimiento

    La hipófisis es muy pequeña; ¡es del tamaño de un guisante! Su función consiste en fabricar y liberar hormonas en tu cuerpo. Si la ropa del año pasado se te ha quedado pequeña es porque la hipófisis ha liberado unas hormonas especiales que te han hecho crecer. Esta glándula también desempeña un papel muy importante en la pubertad. La pubertad es una etapa en la que los cuerpos de los niños y las niñas atraviesan cambios importantes a medida que se van convirtiendo en hombres y mujeres; todo ello gracias a las hormonas liberadas por la hipófisis.

    Esta pequeña glándula participa en la fabricación de muchas otras hormonas, como las que controlan la cantidad de azúcares y de agua que hay en tu cuerpo.

    El hipotálamo controla la temperatura

    El hipotálamo viene a ser el termómetro interno de tu cerebro (como esa cajita que controla la temperatura en tu casa). El hipotálamo sabe a qué temperatura debería estar tu cuerpo (unos 98,6 ºF o 37 ºC). Si tu cuerpo está demasiado caliente, el hipotálamo te indicará que sudes. Si está demasiado frío, el hipotálamo te hará temblar. Temblar y sudar son los intentos que hace tu cuerpo para retomar la temperatura que necesita tener.

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    El cerebro y el sistema nervioso

    El cerebro es como una computadora que controla las funciones del organismo y el sistema nervioso es como una red que envía mensajes a las partes del cuerpo.

    fuente : kidshealth.org

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    fuente : brainly.lat

    G367: Tema 5. Sistema motor: control del movimiento reflejo y voluntario

    Tema 5. Sistema motor: control del movimiento reflejo y voluntario

    Para poder realizar cualquier movimiento, se necesita la interacción de diversas estructuras del sistema nervioso motor. Estas estructuras están organizadas jerárquicamente de modo que las órdenes salen desde un nivel superior hacia un nivel inferior:

    a) El nivel inferior son las y por las .b) Los núcleos del constituyen un nivel intermedio, junto con los sistemas moduladores formados por los y el .c) En el nivel más alto de la jerarquía: la .

    5.1 Médula espinal

    
La médula espinal es la estructura que integra o coordina actividades musculares elementales, para el mantenimiento de la postura y diferentes movimientos. También desarrolla automatismos simples de marcha y movimientos defensivos simples (retirada del músculo ante cualquier agresión) a través de respuestas reflejas.5.1.1 Motoneuronas medulares

    Se distinguen:

    a) . Son de gran tamaño, sus axones están mielinizados y su velocidad de conducción es de 60-130 m/s. Estas neuronas se agrupan en la médula y forman columnas que se conocen como núcleos motores.b)  más pequeñas que las anteriores. Inervan fibras musculares del huso muscular.c) . Pueden ser excitadoras o inhibidoras. Un tipo especial son las interneuronas inhibidoras de Renshaw que reciben conexiones de vías supraespinales y de motoneuronas.5.1.2  Reflejos espinales

    Son las repuestas motoras más simples. Son repuestas automáticas, involuntarias, inmediatas y estereotipadas frente a un estímulo determinado. 
El circuito entre la entrada del estímulo y la ejecución de la respuesta se conoce como arco reflejo. Consta de los siguientes elementos:

    a) .b) .c) .d) .e)Reflejo de estiramiento o miotático, reflejo consistente en un acortamiento de las fibras de un músculo frente al estiramiento brusco del mismo. Es el único reflejo monosináptico que existe. Sirve para controlar y ajustar la longitud de los músculos esqueléticos, proporcionando el tono muscular adecuado para una respuesta rápida.a) .
 Es una pequeña estructura fusiforme situado entre las fibras musculares. Está formado por varias fibras musculares modificadas (fibras intrafusales), con miofilamentos solamente en los extremos e inervación de motoneuronas gamma. En el centro de las fibras se sitúan las terminaciones de fibras sensoriales. Cuando se produce el alargamiento brusco de un músculo, se estiran también las fibras intrafusales. Se excitan las fibras sensoriales, y en la médula espinal sinaptan directamente con una motoneruona a. Ésta envía al músculo estirado la orden de contraerse y de cesar el estiramiento.
 El reflejo miotático se provoca también, como respuesta a una orden del sistema nervioso central. Las neuronas g actúan respondiendo a órdenes que llegan por vías supraespinales. Estimulan las fibras intrafusales, que al contraerse, provocan la excitación de los receptores, y la consiguiente respuesta motora muscular a través de las motoneuronas alfa (a). La coactivación a-g es el fenómeno por el cual, al ordenarse una contracción de la musculatura extrafusal, se activa simultáneamente el sistema g, de forma que las fibras intrafusales se mantengan tensas y no pierdan su capacidad sensora.b) . 
El órgano tendinoso de Golgi está situado en la zona de inserción tendinosa del músculo. Son terminaciones libres y ramificadas. La contracción de las fibras musculares distiende los propioceptores provocando su despolarización. En la médula hacen sinapsis con motoneuronas a, a través de una interneurona inhibidora, disminuyendo su actividad y provocando la relajación del músculo contraído. Son responsables del reflejo miotático inverso.

    5.2 Tronco del encéfalo

    En él se llevan a cabo las siguientes funciones: el control y ajuste del tono muscular, la regulación de la postura y el mantenimiento del equilibrio. En esta región se encuentran núcleos motores que desarrollan programas motores estereotipados conocidos como generadores centrales de pautas o secuencias motoras, como los respiratorios, los de la masticación o los de la marcha.

    Desde los mismos se originan las vías supraespinales, vías que se dirigen hacia la médula y regulan las funciones motoras relacionadas con el mantenimiento del tono, postura y equilibrio. Según su posición, hay dos sistemas:

    1. Sistema motor dorsolateral medular o sistema descendente lateral formado por el haz rubroespinal, que sale del núcleo rojo mesencefálico. Participa en el control de la musculatura distal de las extremidades.2. Sistema ventromedial o sistema descendente medial. Este sistema controla la musculatura axial y la musculatura proximal de las extremidades y está constituido por:a) Los que proceden de los núcleos vestibulares bulbares.b) Los que salen de la formación reticular situada a lo largo del tronco.c) El  que se origina en tubérculo cuadrigémino superior y termina en la médula cervical

    .

    5.2.1  Núcleos motores del tronco del encéfalo
1. Formación reticular o sustancia reticular
A lo largo del tronco del encéfalo hay acúmulos de neuronas con múltiples conexiones entre sí, dando lugar a una especie de retículo. Ésta ejerce su acción excitadora o inhibidora sobre el circuito gamma mediante vías que terminan en las motoneuronas o interneuronas medulares.
.Sus vías son dos: el haz retículoespinal medial (protuberancia y mesencéfalo) y el haz retículoespinal lateral (bulbo). Llevan órdenes opuestas. El primero excita a motoneuronas extensoras encargada de mantener el cuerpo erguido contra la gravedad. El segundo, inhibe a estas mismas neuronas, oponiéndose a la posición antigravitatoria, facilitando por tanto, la acción de los músculos flexores. 
La formación reticular constituye un sistema excitador-inhibidor con la misión de lograr continuamente el tono adecuado de la musculatura.

    .

    fuente : ocw.unican.es

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