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Schemas01:42

Schemas

11.5K
A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.
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Organization of the Brain01:30

Organization of the Brain

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The brain is an integral component of the nervous system and serves as the center for processing sensory inputs, making decisions, and directing bodily actions. This complex organ is organized into three primary sections: the hindbrain, midbrain, and forebrain, each responsible for a range of vital functions.
Hindbrain
The hindbrain, located at the base of the brain, plays a vital role in regulating automatic processes that sustain life. It includes the medulla oblongata, which is essential for...
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Cerebral Hemispheres01:05

Cerebral Hemispheres

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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Direct Motor Pathways01:11

Direct Motor Pathways

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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and...
1.8K
Indirect Motor Pathways01:22

Indirect Motor Pathways

1.4K
The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
1.4K
Anatomy of the Brain: Major Regions01:20

Anatomy of the Brain: Major Regions

3.4K
The brain is the most complex organ in the human body. It consists of four main parts: the cerebrum, diencephalon, cerebellum, and brainstem.
The cerebrum is the largest section of the brain and divides into left and right hemispheres, separated by a deep fissure. The cerebral outer layer of grey matter — the cerebral cortex — comprises elevations called gyri and shallow groves called sulci. The inner portion of white matter includes long nerve fibers known as axons, which connect...
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Video Experimental Relacionado

Updated: May 28, 2025

Utilizing a Reconfigurable Maze System to Enhance the Reproducibility of Spatial Navigation Tests in Rodents
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Utilizing a Reconfigurable Maze System to Enhance the Reproducibility of Spatial Navigation Tests in Rodents

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Caminos restringidos a cerebros complejos

Giacomo Gattoni1, Maria Antonietta Tosches1

  • 1Department of Biological Sciences, Columbia University, New York, NY, USA.

Science (New York, N.Y.)
|February 13, 2025
PubMed
Resumen
Este resumen es generado por máquina.

El desarrollo neuronal y la evolución del circuito cerebral muestran una sorprendente convergencia entre las aves y los mamíferos. Esto sugiere que los mecanismos de desarrollo compartidos dan forma a estructuras cerebrales complejas en especies lejanamente relacionadas.

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Last Updated: May 28, 2025

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Área de la Ciencia:

  • La neurociencia
  • Biología evolutiva
  • Anatomía comparada

Sus antecedentes:

  • Comprender la evolución de las estructuras cerebrales complejas es crucial para descifrar las habilidades cognitivas.
  • Las aves y los mamíferos, a pesar de los distintos caminos evolutivos, muestran notables similitudes en la organización del cerebro.

Objetivo del estudio:

  • Investigar la evolución convergente del desarrollo neuronal y los circuitos cerebrales en los linajes de aves y mamíferos.
  • Identificar los mecanismos moleculares y de desarrollo comunes que subyacen a la complejidad del cerebro.

Principales métodos:

  • Análisis genómico comparativo de genes clave del desarrollo neuronal.
  • Comparaciones histológicas y neuroanatómicas de las estructuras del cerebro.
  • Análisis de las vías de desarrollo en organismos modelo de ambos grupos.

Principales resultados:

  • Evidencia de vías moleculares convergentes que regulan la neurogénesis y la migración neuronal.
  • Patrones similares de expresión génica en regiones cerebrales homólogas.
  • Similaridades funcionales en el procesamiento sensorial y los circuitos de control motor.

Conclusiones:

  • El desarrollo neuronal y la evolución del circuito cerebral han convergido en las aves y los mamíferos.
  • Los principios de desarrollo compartidos contribuyen a la evolución independiente de cerebros complejos.
  • Esta convergencia ofrece información sobre las limitaciones y posibilidades fundamentales de la evolución del cerebro.