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Related Concept Videos

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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Lobes of the Cerebrum01:22

Lobes of the Cerebrum

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The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements....
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Lateralization01:28

Lateralization

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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Cerebrum: Anatomical Overview II01:11

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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...
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Anatomy of the Brain: Ventricles01:18

Anatomy of the Brain: Ventricles

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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.
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Diencephalon: Anatomical Regions01:30

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The diencephalon, etymologically translated as 'through brain,' plays an integral role as the conduit between the cerebrum and the vast extent of the nervous system. However, the olfactory system is an exception, as it interfaces directly with the cerebrum. The diencephalon, deeply ensconced beneath the cerebrum, primarily consists of three paired structures — the thalamus, hypothalamus, and epithelamus. It also includes accessory structures such as the subthalamus, which houses the...
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Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
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Interhemispheric Connectivity of the Human Temporal Lobes.

Jeffrey R Binder, Mónica Giraldo-Chica, Jedediah Mathis

    Biorxiv : the Preprint Server for Biology
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    This summary is machine-generated.

    This study maps human temporal lobe white matter connections using diffusion tractography, revealing detailed spatial relationships and previously undescribed projections. The findings enhance understanding of interhemispheric integration crucial for cognition and surgical planning.

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    Area of Science:

    • Neuroscience
    • Neuroanatomy
    • Diffusion Tensor Imaging

    Background:

    • Major white matter tracts connect the temporal lobes via the corpus callosum, anterior commissure, and dorsal hippocampal commissure.
    • Precise spatial location and inter-tract relationships of these pathways remain incompletely understood.

    Purpose of the Study:

    • To create a detailed atlas of human temporal lobe interhemispheric white matter tracts.
    • To visualize the spatial relationships and anatomical details of these tracts using advanced imaging techniques.

    Main Methods:

    • High angular resolution diffusion tensor imaging (DTI) tractography was employed.
    • Tractography data were visualized on serial orthogonal sections.
    • Individual tract probability maps were intersected with cortical surfaces.

    Main Results:

    • The corpus callosum's splenium shows distinct dorsal and ventral bundles, with no temporal projections in the caudal third.
    • The transcallosal pathway branches into medial and lateral divisions and projects to the external capsule and claustrum.
    • Complex overlap and interdigitation were observed between transcallosal and anterior commissure tracts.

    Conclusions:

    • This atlas provides unprecedented detail on temporal lobe white matter organization.
    • Findings are critical for surgical planning in the temporal lobe.
    • The data support functional-anatomical models of interhemispheric temporal lobe integration in cognition.