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Related Concept Videos

Overview of Somatic Sensory Pathways01:29

Overview of Somatic Sensory Pathways

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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
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Motor and Sensory Areas of the Cortex01:14

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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....
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Major Somatic Sensory Pathways01:28

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Somatosensory, Motor, and Association Cortex01:24

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Association Areas of the Cortex01:21

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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,...
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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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Modification of a Colliculo-thalamocortical Mouse Brain Slice, Incorporating 3-D printing of Chamber Components and Multi-scale Optical Imaging
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Corticothalamic Pathways From Layer 5: Emerging Roles in Computation and Pathology.

Rebecca A Mease1, Antonio J Gonzalez1

  • 1Institute of Physiology and Pathophysiology, Medical Biophysics, Heidelberg University, Heidelberg, Germany.

Frontiers in Neural Circuits
|September 27, 2021
PubMed
Summary

Cortical layer 5 (L5) neurons significantly impact thalamic computations via cortico-thalamo-cortical (CTC) circuits. Understanding these higher-order networks is crucial for insights into learning, perception, and neurological disorders.

Keywords:
burstingcorticothalamichigher-order thalamuslayer 5neural codingpathologypyramidal neuronsthalamus

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Cortical layer 5 (L5) neurons provide substantial input to thalamic regions.
  • Higher-order cortico-thalamo-cortical (CTC) circuits, distinct from first-order, are vital for perception and learning.
  • Dysfunction in these L5-recipient thalamic pathways is linked to various pathologies.

Purpose of the Study:

  • To review recent advancements in understanding L5-originating CTC networks.
  • To summarize the anatomical, physiological, and computational characteristics of these networks.
  • To highlight their role in pathology and computational theories.

Main Methods:

  • Review of studies utilizing cell-type-specific tools for precise circuit access.
  • Analysis of research across diverse sensory modalities and brain regions.
  • Integration of single-neuron and synaptic properties with network function.

Main Results:

  • L5 CTC networks are anatomically and functionally distinct.
  • These networks play an integral role in cortical functions like learning and perception.
  • Emerging evidence links L5 CTC network dysfunction to pathological states.

Conclusions:

  • L5 CTC networks are critical for higher-order brain functions.
  • Their properties offer a promising avenue for computational neuroscience research.
  • Understanding L5 CTC networks is key to deciphering brain computation and neurological disease.