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Direct Motor Pathways

Direct Motor Pathways

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.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and...

Propagation of Action Potentials

Propagation of Action Potentials

The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...

Hierarchy of Motor Control

Hierarchy of Motor Control

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.

Motor and Sensory Areas of the Cortex

Motor and Sensory Areas of the Cortex

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.
Motor Areas
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Action Potential

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Indirect Motor Pathways

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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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Related Experiment Video

Updated: Dec 26, 2025

In Vivo Wireless Optogenetic Control of Skilled Motor Behavior

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Published on: November 22, 2021

Propagating Motor Cortical Dynamics Facilitate Movement Initiation.

Karthikeyan Balasubramanian¹, Vasileios Papadourakis¹, Wei Liang²

¹Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA.

|March 8, 2020

Summary

This summary is machine-generated.

Propagating patterns of brain activity in the primary motor cortex (M1) are crucial for voluntary movement initiation. This study reveals these patterns are direction-specific and essential for reaction times and motor control.

Keywords:

beta attenuation beta oscillations functional connectivity intracortical microstimulation motor cortex movement initiation propagating patterns spatiotemporal patterns

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Area of Science:

Neuroscience
Motor Control
Computational Neuroscience

Background:

Voluntary movement initiation involves neural modulations in the primary motor cortex (M1).
Similar neural modulations occur during movement planning, even without actual movement, posing a challenge in understanding movement initiation mechanisms.

Purpose of the Study:

To investigate the existence and role of sequential spatiotemporal patterns of cortical excitability in M1 during voluntary movement initiation.
To determine if these patterns are direction-specific and causally linked to movement execution and reaction time.

Main Methods:

Utilized spatiotemporal patterns of intracortical microstimulation in the primary motor cortex (M1).
Analyzed functional connectivity among M1 units during movement planning and execution.
Investigated the decoding accuracy of muscle activity using beta amplitude profiles.

Main Results:

Identified a sequential spatiotemporal pattern of excitability propagating across M1 in a specific rostro-caudal direction prior to movement initiation.
Demonstrated that reaction time significantly increases when microstimulation opposes this natural propagation direction, but not when it aligns with it.
Observed the emergence of functional connections among M1 units during movement, oriented along the rostro-caudal axis, which were absent during planning.
Showed that beta amplitude profiles more accurately decode muscle activity when they follow the natural propagating patterns.

Conclusions:

Provided the first causal evidence that large-scale, propagating patterns of cortical excitability in M1 are behaviorally relevant for voluntary movement initiation.
These directional propagating patterns are a necessary component for initiating voluntary movements and are linked to motor control and reaction time.