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Somatosensory, Motor, and Association Cortex01:24

Somatosensory, Motor, and Association Cortex

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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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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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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.
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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:
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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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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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Related Experiment Video

Updated: Aug 14, 2025

Cheek Injection Model for Simultaneous Measurement of Pain and Itch-related Behaviors
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The prelimbic cortex regulates itch processing by controlling attentional bias.

Guang-Yan Wu1,2, Xiao-Xia Zheng1, Shan-Lan Zhao1

  • 1Experimental Center of Basic Medicine, College of Basic Medical Sciences, Army Medical University, Chongqing 400038, China.

Iscience
|January 9, 2023
PubMed
Summary
This summary is machine-generated.

The prelimbic cortex (PrL) regulates itch processing by modulating attention. Manipulating itch-related neurons in the PrL disrupted scratching, revealing how attention bias impacts itch perception.

Keywords:
Biological sciencesCell biologyNeuroscience

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Area of Science:

  • Neuroscience
  • Sensory processing

Background:

  • Itch is a complex sensory experience with poorly understood neural underpinnings.
  • While sensory and emotional aspects of itch are studied, brain mechanisms for attentional processing remain unclear.

Purpose of the Study:

  • To identify key brain regions and neural mechanisms modulating attentional processing of itch.
  • To investigate the role of the prelimbic cortex (PrL) in itch regulation and attention.

Main Methods:

  • Investigated itch processing in the prelimbic cortex (PrL).
  • Manipulated itch-responsive and attention-related neurons in the PrL.
  • Assessed the impact of attentional bias on itch-induced scratching.

Main Results:

  • The prelimbic cortex (PrL) is crucial for itch processing.
  • Manipulating PrL neurons disrupted itch-induced scratching.
  • Increased attentional bias toward distractions reduced itch processing.
  • Identified overlapping populations of itch-responsive and attention-related neurons in the PrL.

Conclusions:

  • The prelimbic cortex (PrL) regulates itch processing by controlling attentional bias.
  • Itch-responsive and attention-related neurons in the PrL are interchangeable in regulating itch.
  • Findings elucidate the neural basis of attention's role in modulating itch perception.