Video Experimental Relacionado
Updated: May 8, 2026
07:42
Dissection of Hippocampal Dentate Gyrus from Adult Mouse
Published on: November 18, 2009
Evolución mosaica de la estructura cerebral en los mamíferos
1Department of Anthropology, University of Durham, UK. r.a.barton@durham.ac.uk
Nature
|July 13, 2000
Resumen
La evolución del cerebro de los mamíferos muestra un cambio mosaico, no sólo un crecimiento coordinado. Regiones específicas del cerebro como el neocórtex se expandieron de forma independiente, desafiando las teorías de la plasticidad limitada del desarrollo.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología evolutiva Biología evolutiva.
- Anatomía comparada y anatomía comparada.
Sus antecedentes:
- El cerebro de los mamíferos tiene sistemas funcionalmente distintos.
- Investigaciones anteriores sugirieron que las limitaciones del desarrollo limitaban la evolución del mosaico en el cerebro, causando cambios de tamaño coordinados.
- Este estudio investiga el alcance de la evolución del mosaico en la estructura cerebral de los mamíferos.
Objetivo del estudio:
- Para analizar datos comparativos sobre la evolución de la estructura cerebral de los mamíferos.
- Para demostrar que el cambio de mosaico ha sido un factor significativo en la evolución del cerebro.
- Desafiar la noción de que las limitaciones del desarrollo dictan exclusivamente la evolución del cerebro.
Principales métodos:
- Análisis comparativo de los volúmenes de la estructura cerebral en diferentes grupos de mamíferos.
- Análisis estadístico para dar cuenta de las relaciones de escalado alométrico.
- Examen de los cambios evolutivos a nivel de las subdivisiones básicas del cerebro y los sistemas funcionales de grano fino.
Principales resultados:
- El volumen del neocórtex muestra diferencias significativas entre los primates y los insectívoros, independientemente del tamaño general del cerebro.
- Las estructuras cerebrales con fuertes vínculos anatómicos y funcionales evolucionaron de manera cohesiva, pero no siempre en coordinación con otros componentes cerebrales.
- La evolución mosaica se observó en diferentes niveles de organización cerebral, desde amplias subdivisiones hasta sistemas funcionales específicos.
Conclusiones:
- La evolución mosaica, caracterizada por cambios selectivos de tamaño en los componentes cerebrales, es un motor clave de la evolución del cerebro de los mamíferos.
- Las limitaciones del desarrollo no impiden por completo la evolución independiente de los sistemas cerebrales.
- La evolución del cerebro implica una compleja interacción entre cambios coordinados e independientes en sus partes constituyentes.
Videos de Conceptos Relacionados
01:20Anatomy of the Brain: Major Regions
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 various areas...
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 various areas...
01:18Anatomy of the Brain: Ventricles
There are hollow fluid-filled cavities known as ventricles deep inside the human brain. There are two lateral ventricles, one in each cerebral hemisphere, and each has three different projections — the anterior, inferior, and posterior horns visible from the lateral side. A thin membrane called the septum pellucidum separates the two lateral ventricles. The slender third ventricle in the diencephalon is connected to each lateral ventricle via a channel called the interventricular foramen. The...
01:15Functional Brain Systems: Limbic System
The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
01:26Higher Mental Functions of Brain: Learning and Memory
Memory is one of the most vital higher mental functions of the brain. Memory is closely related to learning because it enables us to retain information and experiences from our past to use them in our present life. It also helps us to remember facts, events, and skills, such as riding a bike or swimming. There are two types of memory — declarative memory, which involves memorizing facts or events, and procedural memory, which enables us to remember how to do something like writing or playing an...
01:30Organization of the Brain
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...
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...
01:19Role of Hippocampus in Memory
The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...