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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.
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Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Related Experiment Video

Updated: Oct 29, 2025

Corticospinal Excitability Modulation During Action Observation
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Changes in Corticospinal Circuits During Premovement Facilitation in Physiological Conditions.

Giovanni Cirillo1,2, Ilaria Antonella Di Vico2, Mehran Emadi Andani2

  • 1Laboratory of Morphology of Neuronal Network, Division of Human Anatomy, Department of Mental, Physical Health and Preventive Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy.

Frontiers in Human Neuroscience
|July 8, 2021
PubMed
Summary

This study reveals premovement facilitation (PMF) in corticospinal excitability during reaction time tasks. Excitatory circuits selectively enhance motor evoked potentials in the target muscle before movement onset.

Keywords:
MEPmotor cortexpremovement facilitationreaction timetranscranial magnetic stimulation

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Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • Corticospinal excitability changes before movement, but underlying mechanisms remain unclear.
  • Understanding these preparatory changes is crucial for motor control research.

Purpose of the Study:

  • To investigate functional changes in excitatory corticospinal circuits during a reaction time (RT) motor task.
  • To elucidate the role of these circuits in selective muscle preparation.

Main Methods:

  • 26 healthy subjects (HS) underwent single pulse transcranial magnetic stimulation (TMS) over the primary motor cortex (M1).
  • Motor evoked potentials (MEP) were recorded from the abductor pollicis brevis (APB) and abductor digiti minimi (ADM) at varying intervals before movement onset during an RT task.

Main Results:

  • Premovement facilitation (PMF) was observed, with increased MEP amplitude in APB at 50, 100, and 150 ms before movement onset.
  • This facilitation was more pronounced at shorter intervals and specific to the target muscle (APB), not the task-irrelevant ADM.
  • Reaction time (RT) showed time-dependent changes, and TMS effects on MEP amplitude were dominant-side dependent.

Conclusions:

  • The study demonstrates side-dependent, selective, and facilitatory effects on MEP amplitude during RT tasks, confirming PMF.
  • These findings support the role of excitatory corticospinal mechanisms in selective muscle preparation before voluntary movement.