Video Experimental Relacionado
Updated: Sep 28, 2025
10:05
A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
Published on: May 7, 2017
12.4K
El camino hacia un cerebro más grande
1Department of Biology, University of New Mexico, Albuquerque, NM 87131-0001, USA.
Science (New York, N.Y.)
|March 31, 2022
Resumen
Los primeros mamíferos del Cenozoico crecieron más grandes debido a las oportunidades ecológicas, no al aumento de la inteligencia. Este período favoreció el tamaño sobre la evolución cognitiva en la diversificación de los mamíferos.
Área de la Ciencia:
- Paleontología
- Biología evolutiva
- Evolución de los mamíferos
Sus antecedentes:
- La era Cenozoica temprana siguió al evento de extinción del Cretácico Paleógeno.
- Este período presentó importantes oportunidades ecológicas para la supervivencia de los taxones, incluidos los mamíferos.
Objetivo del estudio:
- Para investigar las presiones selectivas que impulsan la evolución de los mamíferos en el Cenozoico temprano.
- Determinar si el aumento del tamaño corporal o las capacidades cognitivas mejoradas fueron los principales impulsores de la diversificación.
Principales métodos:
- Análisis de los registros fósiles del Cenozoico temprano.
- Estudios comparativos de la morfología esquelética de los mamíferos y el tamaño inferido del cerebro.
Principales resultados:
- La evidencia fósil indica una tendencia significativa hacia tamaños de cuerpo más grandes en numerosos linajes de mamíferos.
- No se observó una tendencia consistente de aumento del tamaño relativo del cerebro (encefalización) en correlación con la diversificación.
Conclusiones:
- Las oportunidades ecológicas en el Cenozoico temprano favorecieron principalmente un aumento en el tamaño corporal de los mamíferos.
- La diversificación de los mamíferos durante esta época fue impulsada más por la explotación de nuevos nichos ecológicos a través del gigantismo que por los avances cognitivos.
Videos de Conceptos Relacionados
01:30Organization of the Brain
1.3K
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...
1.3K
01:30Biological Influences on Intelligence
237
Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter...
237
01:11Cerebrum: Anatomical Overview II
2.7K
Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
2.7K
01:20Anatomy of the Brain: Major Regions
6.9K
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...
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...
6.9K
01:26Cerebrum: Anatomical Overview I
3.0K
The main and largest component of the human brain is the cerebrum. The cerebrum consists of two main parts: the cerebral cortex, an outer layer with wrinkles or folds known as gyri and shallow grooves called sulci, and a deeper region beneath it. The cerebrum divides into two distinct hemispheres and contains five different lobes: the frontal, parietal, temporal, occipital, and insula. The central sulcus separates the frontal and parietal lobes and two functionally important gyri — the...
3.0K
01:18Anatomy of the Brain: Ventricles
5.4K
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.
5.4K