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Related Concept Videos

Diencephalon: Thalamus and Information Relay01:27

Diencephalon: Thalamus and Information Relay

The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological states or needs.
Direct Motor Pathways01:11

Direct Motor Pathways

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 the...
Cerebral Hemispheres01:05

Cerebral Hemispheres

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...
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Cerebrum: Anatomical Overview II01:11

Cerebrum: Anatomical Overview II

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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Related Experiment Video

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Fiber Connections of the Supplementary Motor Area Revisited: Methodology of Fiber Dissection, DTI, and Three Dimensional Documentation
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Distinct functions for direct and transthalamic corticocortical connections.

S Murray Sherman1, R W Guillery

  • 1Department of Neurobiology, The University of Chicago, 947 E. 58th St., MC 0926, 316 Abbott, Chicago, IL 60637, USA. msherman@bsd.uchicago.edu

Journal of Neurophysiology
|June 17, 2011
PubMed
Summary

Cortical areas communicate via direct and transthalamic pathways. Transthalamic pathways, unlike direct ones, transmit information and motor instructions, acting as a gated information channel.

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Area of Science:

  • Neuroscience
  • Cerebral Cortex
  • Thalamus

Background:

  • Cortical areas extensively interact through direct and indirect pathways.
  • Understanding the functional roles of these parallel pathways is crucial for deciphering brain communication.

Purpose of the Study:

  • To functionally distinguish between direct corticocortical and transthalamic corticocortical pathways.
  • To elucidate the information-carrying capacity of these distinct neural circuits.

Main Methods:

  • Functional classification of neural pathways based on information transmission capabilities.
  • Analysis of corticocortical and corticothalamocortical communication routes.

Main Results:

  • Transthalamic pathways are identified as Class 1 (driver) pathways, capable of transmitting information.
  • Direct pathways can be either Class 1 (driver) or Class 2 (modulator).
  • Transthalamic pathways act as a gated channel, relaying cortical processing and motor output information.

Conclusions:

  • Transthalamic pathways play a critical role in information transfer and gating between cortical areas.
  • These pathways integrate information about ongoing cortical processing and motor commands.
  • The functional dichotomy of pathways highlights distinct roles in neural computation.