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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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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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Cerebro-spinal somatotopic organization uncovered through functional connectivity mapping.

Caroline Landelle1, Nawal Kinany2,3, Benjamin De Leener4,5

  • 1McConnell Brain Imaging Centre, Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada.

Imaging Neuroscience (Cambridge, Mass.)
|August 13, 2025
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Summary

This study reveals the shared somatotopy between the brain and spinal cord using resting-state functional MRI (fMRI). This non-invasive technique maps sensorimotor pathways, offering new insights into central nervous system organization.

Keywords:
cerebro-spinal fMRIfunctional connectivityresting-statesomatotopy

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Medical Imaging

Background:

  • Somatotopy, the mapping of body parts to the central nervous system (CNS), is crucial for sensorimotor function.
  • Previous studies examined brain and spinal cord somatotopy separately, often requiring invasive stimulation.
  • The in vivo somatotopic organization of human cerebro-spinal functional connections remained unexplored.

Purpose of the Study:

  • To investigate the shared somatotopy between the brain and cervical spinal cord in humans.
  • To demonstrate the utility of simultaneous resting-state functional MRI (fMRI) for mapping cerebro-spinal functional connections.
  • To establish a non-invasive method for probing large-scale sensorimotor system organization.

Main Methods:

  • Simultaneous brain and cervical spinal cord functional magnetic resonance imaging (fMRI) was employed.
  • Resting-state functional connectivity analyses were used to identify correlations between spinal cord segments and brain regions.
  • A complementary data-driven analysis validated the identified somatotopic organization.

Main Results:

  • A somatotopic gradient was revealed within the cortical sensorimotor network based on functional connectivity patterns.
  • Distinct brain regions showed preferential correlations with specific spinal cord segments.
  • Spinal cord segments were successfully identified by their connectivity profiles with the sensorimotor cortex.

Conclusions:

  • Resting-state cerebro-spinal fMRI can effectively probe the large-scale somatotopic organization of the human sensorimotor system.
  • This non-invasive approach requires minimal experimental burden.
  • Findings hold promise for understanding normal and impaired somatosensory-motor functions.