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Somatosensory, Motor, and Association Cortex01:23

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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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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 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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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
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The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
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Functionally connected brain regions in the network activated during capsaicin inhalation.

Michael J Farrell1, Saskia Koch, Ayaka Ando

  • 1Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, Australia; Anatomy and Neuroscience, University of Melbourne, Parkville, Australia.

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Coughing is a brain-coordinated airway defense. This study reveals that inhaling irritants activates a distributed brain network, highlighting the central representation of airway defense mechanisms.

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Area of Science:

  • Neuroscience
  • Respiratory Physiology

Background:

  • Coughing and the urge-to-cough are vital protective airway reflexes coordinated by the brain.
  • Airway challenges, like inhaling noxious substances, trigger widespread brain responses for perception and behavioral reactions.

Purpose of the Study:

  • To investigate the brain's functional connectivity during airway challenge.
  • To differentiate regional brain responses related to cough suppression, stimulus intensity, and urge-to-cough perception.

Main Methods:

  • Functional connectivity analyses were employed.
  • Brain responses to capsaicin inhalation were examined.
  • Seed regions were defined based on prior activation studies.

Main Results:

  • The study identified subnetworks within the broader brain network responding to airway challenge.
  • These subnetworks mirrored previously identified regions involved in discrete functional components of airway challenge.
  • Functional connectivity analyses differentiated regional brain responses during capsaicin inhalation.

Conclusions:

  • The central representation of airway defense is a distributed network.
  • Understanding these brain networks is crucial for managing cough and related respiratory conditions.