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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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...
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Somatosensation01:33

Somatosensation

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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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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

Association Areas of the Cortex

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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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Author Spotlight: Deciphering Neural Circuit Formation from Two-Photon Microscopy and Single Neuron Imaging
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Cell-class-specific orofacial motor maps in mouse neocortex.

Keita Tamura1, Pol Bech2, Hidenobu Mizuno3

  • 1Laboratory of Sensory Processing, Brain Mind Institute, Faculty of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland; Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3EG, UK; International Research Center for Medical Sciences, Kumamoto University, Kumamoto 860-0811, Japan.

Current Biology : CB
|February 27, 2025
PubMed
Summary
This summary is machine-generated.

Researchers discovered distinct, genetically defined neuron groups form specific modules within orofacial motor maps. These cell-class-specific modules interact across brain regions to control jaw movements and adapt during motor learning.

Keywords:
calcium imagingcell classescortical homunculuscortical organizationmotor controlmotor cortexmotor mapoptogeneticsprojection neuronssensory cortex

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cortical Organization

Background:

  • Cortical motor maps are key to voluntary movement but their detailed structure is unclear.
  • Understanding how different cortical areas form functional motor units is crucial.

Purpose of the Study:

  • To investigate the organization of cortical motor maps by stimulating genetically defined neuron populations.
  • To identify functional units within orofacial motor maps.

Main Methods:

  • Selective optogenetic stimulation of genetically defined excitatory neuron subpopulations in the cortex.
  • Refining cortical motor maps for jaw opening.
  • Wide-field calcium imaging to observe neural activity propagation.
  • Assessing motor map stability during lick motor learning.

Main Results:

  • Spatially segregated, cell-class-specific modules were identified within orofacial motor maps.
  • Jaw-opening motor maps varied based on the stimulated neuron class, localizing to primary motor, secondary motor, or somatosensory areas.
  • Activity propagated from stimulated modules to the primary motor area, correlating with movement vigor.
  • Motor map modules showed stability during learning, with some cell-class-specific expansion.

Conclusions:

  • Distinct cell-class-specific modules interact across sensorimotor cortices to control orofacial movements.
  • These findings reveal a new layer of organization within cortical motor maps.