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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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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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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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The hierarchy of motor control refers to the different levels of organization and processing involved in controlling movement in the body. These levels range from higher cortical areas involved in planning and decision-making to lower spinal cord reflexes that respond automatically to external stimuli.
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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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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.
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Updated: Jun 27, 2025

Corticospinal Excitability Modulation During Action Observation
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Corticospinal Modulation of Precision Movements.

Francesca Marino1, Yunuen Moreno-López2, Edmund Hollis2,3

  • 1University of California, San Francisco, CA, USA.

Neuroscience Insights
|April 29, 2024
PubMed
Summary
This summary is machine-generated.

Learning precise movements relies on temporal coding of corticospinal activity. Simpler movements, however, are corticospinal independent, showing widespread co-activation instead of temporal coding.

Keywords:
Corticospinalmotor controlmotor cortexmotor learning

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Area of Science:

  • Neuroscience
  • Motor Control
  • Motor Learning

Background:

  • Corticospinal (CS) and corticostriatal neurons play key roles in motor control.
  • Temporal coding of CS activity is crucial for precise movements.
  • Motor learning involves large-scale network remodeling.

Purpose of the Study:

  • To investigate the role of temporal coding in corticospinal activity during different prehension tasks.
  • To determine the corticospinal tract's involvement in precise versus adaptive movements.
  • To explore the neural mechanisms underlying motor learning and control.

Main Methods:

  • Optogenetic modulation of corticospinal activity.
  • Transection of the corticospinal tract.
  • Behavioral analysis of prehension movements (precision isometric pull and adaptive isometric pull).

Main Results:

  • Temporal coding of CS activity is critical for precise prehension movements.
  • Learning of precision isometric pull induces significant remodeling of CS motor networks.
  • Adaptive isometric pull, a simpler task, exhibits widespread CS co-activation and limited temporal coding.
  • The adaptive isometric pull task was found to be corticospinal independent.

Conclusions:

  • Corticospinal tract involvement in motor control differs based on task complexity.
  • Temporal coding is essential for fine motor control and precision.
  • Simpler motor tasks may rely on alternative pathways, demonstrating corticospinal independence.