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Related Concept Videos

Direct Motor Pathways01:11

Direct Motor Pathways

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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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Indirect Motor Pathways01:22

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The indirect motor or extrapyramidal pathways originate in the brainstem, the lower portion of the brain that connects it to the spinal cord. They consist of several distinct tracts, each with specialized functions. The four main tracts of the indirect motor pathways are the vestibulospinal tract, the reticulospinal tract, the tectospinal tract, and the rubrospinal tract.
The vestibulospinal tract originates in the vestibular nuclei of the brainstem. The vestibular system detects changes in...
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Related Experiment Video

Updated: Apr 4, 2026

Targeting the Corticospinal Tract in Neonatal Rats with a Double-Viral Vector using Combined Brain and Spine Surgery
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Recovery of Dexterous Motor Control via Non-Monosynaptic Corticospinal Pathways.

Erynn Sorensen1,2,3, Luigi Borda4, Julia Ostrowski1,5,6

  • 1Rehabilitation and Neural Engineering Labs (RNEL), University of Pittsburgh, Pittsburgh, PA, USA.

Medrxiv : the Preprint Server for Health Sciences
|April 3, 2026
PubMed
Summary

Spinal cord stimulation (SCS) enabled stroke survivors with hemiparesis to regain arm and hand control. This occurred via non-monosynaptic corticospinal tract (CST) pathways, not direct motor cortex connections, by modulating spinal reflexes.

Keywords:
Corticospinal tractarmdexterityhandmonosynapticmotor controlprimary afferent depolarizationspinal cord stimulationstroke

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Motor Control

Background:

  • Human arm motor control is traditionally thought to rely on direct monosynaptic connections from the motor cortex to spinal motoneurons.
  • Post-stroke hemiparesis significantly impairs fine motor function due to damage in the corticospinal tract (CST).

Purpose of the Study:

  • To investigate if non-monosynaptic corticospinal tract (CST) pathways can be leveraged to restore dexterous arm and hand control in individuals with post-stroke hemiparesis.
  • To elucidate the mechanisms by which epidural cervical spinal cord stimulation (SCS) influences motor output in stroke survivors.

Main Methods:

  • A pilot clinical study involving participants with post-stroke hemiparesis receiving continuous epidural cervical spinal cord stimulation (SCS).
  • Electrophysiological assessments including transcranial magnetic stimulation (TMS), electromyography (EMG) spectral analysis, and single motor-unit recordings.
  • Analysis of corticospinal connectivity and spinal reflex modulation.

Main Results:

  • Participants demonstrated improved arm and hand strength, reaching smoothness, and fine force control during SCS.
  • SCS did not consistently strengthen direct CST activation of motoneurons.
  • Evidence suggests SCS sculpted spinal reflexes through polysynaptic pathways, including presynaptic gating, to enhance functionally relevant muscle activation.

Conclusions:

  • Non-monosynaptic CST pathways play a crucial role in fine-tuning spinal motor output after stroke.
  • Epidural cervical SCS offers a potential therapeutic strategy to re-enable dexterous motor control in stroke survivors by engaging these residual pathways.