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A Functional Topographic Map for Spinal Sensorimotor Reflexes.

Graziana Gatto1, Steeve Bourane2, Xiangyu Ren3

  • 1Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA.

Neuron
|November 12, 2020
PubMed
Summary
This summary is machine-generated.

Spinal cord dorsal horn excitatory interneurons (INs) control sensorimotor reflexes. Different IN classes in specific spinal cord regions drive distinct behaviors like scratching and paw withdrawal, revealing spatial organization principles.

Keywords:
Corrective ReflexesInnate BehaviorItchProtective ReflexesSensorimotor IntegrationSomatosensationSomatosensory codingSpinal CircuitsTouch

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Area of Science:

  • Neuroscience
  • Spinal Cord Physiology
  • Motor Control

Background:

  • Cutaneous somatosensory information is crucial for sensorimotor behaviors, including protective and corrective reflexes.
  • The precise role of dorsal horn interneurons (INs) in encoding somatosensory modalities and generating motor behaviors remains unclear.

Purpose of the Study:

  • To functionally investigate the contribution of eight classes of dorsal excitatory INs to sensorimotor reflex responses.
  • To elucidate the spatial organization of the dorsal horn in processing somatosensory information.

Main Methods:

  • Utilized an intersectional genetic approach for functional assessment of specific IN populations.
  • Examined the role of distinct IN classes in mediating sensorimotor reflexes.

Main Results:

  • Demonstrated that the dorsal horn is organized into spatially restricted excitatory modules comprising molecularly diverse cell types.
  • Identified specific IN populations responsible for distinct reflexes: Laminae I/II INs for itch-induced scratching, Laminae II/III INs for paw withdrawal, and Laminae III/IV INs for corrective reflexes.

Conclusions:

  • Sensorimotor reflexes are driven by the differential spatial recruitment of excitatory neurons in the dorsal horn.
  • Revealed a fundamental principle of spinal somatosensory processing based on the spatial organization of INs.