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Related Concept Videos

Diencephalon: Thalamus and Information Relay01:27

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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...
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The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
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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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The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
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The medulla oblongata is a crucial part of the brainstem responsible for controlling various autonomic and involuntary functions. It contains several nuclei, including the olivary, cuneate, gracile, and solitary nuclei.
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The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
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Thalamic reticular nucleus in the thalamocortical loop.

Norio Takata1

  • 1Department of Neuropsychiatry, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo, 160-8582, Japan.

Neuroscience Research
|December 9, 2019
PubMed
Summary

The thalamic reticular nucleus (TRN) gates information flow in the brain. This review details TRN neuron diversity and its role in modulating brain region connectivity for cognitive functions.

Keywords:
CortexCorticocortical loopFunctional connectivityThalamic reticular nucleusThalamocortical loopThalamus

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Cellular Neuroscience

Background:

  • Dynamic neural connectivity is essential for cognitive functions.
  • The thalamic reticular nucleus (TRN) regulates information flow via inhibitory pathways.
  • Understanding TRN function is key to understanding brain network dynamics.

Purpose of the Study:

  • To review anatomical and physiological studies of the rodent TRN.
  • To describe the diversity and heterogeneity of TRN neurons.
  • To outline thalamocortical and cortico-cortical connections involving the TRN.

Main Methods:

  • Review of anatomical studies.
  • Summary of single-cell-level physiological studies.
  • Analysis of molecular expression and axonal innervation patterns.

Main Results:

  • TRN neurons exhibit significant diversity in axonal projections, molecular markers, and physiological properties.
  • Detailed characterization of TRN's inhibitory role in the thalamocortical loop.
  • Elucidation of cortico-cortical and thalamocortical interactions centered on the TRN.

Conclusions:

  • The TRN plays a crucial role in modulating functional connectivity between brain regions.
  • TRN's gating of transthalamic information flow is a key mechanism for cognitive control.
  • TRN neuron heterogeneity likely underlies its diverse modulatory functions.