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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...

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.

Diencephalon: Thalamus and Information Relay

Diencephalon: Thalamus and Information Relay

The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...

Indirect Motor Pathways

Indirect Motor Pathways

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...

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
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor...

Brainstem

Brainstem

The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
The Midbrain
The midbrain is located beneath the diencephalon and connects the cerebrum with the lower parts of the brain. The cerebral peduncles are prominent midbrain structures that house the...

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Related Experiment Video

Updated: May 12, 2025

Study Motor Skill Learning by Single-pellet Reaching Tasks in Mice

Study Motor Skill Learning by Single-pellet Reaching Tasks in Mice

Published on: March 4, 2014

Motor learning refines thalamic influence on motor cortex.

Assaf Ramot^1,2,3,4, Felix H Taschbach^1,5, Yun C Yang^1,2,3,4

¹Department of Neurobiology, University of California San Diego, La Jolla, CA, USA.

|May 7, 2025

Summary

This summary is machine-generated.

Motor learning reshapes how the motor thalamus activates the primary motor cortex (M1). This allows M1 to better control learned movements by preferentially activating specific neurons.

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Related Experiment Videos

Last Updated: May 12, 2025

Study Motor Skill Learning by Single-pellet Reaching Tasks in Mice

Study Motor Skill Learning by Single-pellet Reaching Tasks in Mice

Published on: March 4, 2014

Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation

Stimulating the Lip Motor Cortex with Transcranial Magnetic Stimulation

Published on: June 14, 2014

In Vivo Wireless Optogenetic Control of Skilled Motor Behavior

In Vivo Wireless Optogenetic Control of Skilled Motor Behavior

Published on: November 22, 2021

Area of Science:

Neuroscience
Motor Control
Learning and Memory

Background:

The primary motor cortex (M1) is crucial for motor skill learning and execution.
Superficial layers (L2/3) of M1 are key sites for plasticity during motor learning.
How upstream regions influence M1 during learned movement execution is not well understood.

Purpose of the Study:

To investigate how motor learning alters the activation of M1 circuits by upstream inputs.
To identify the role of the motor thalamus in encoding learned movements in M1.
To determine if thalamic inputs to M1 change with motor learning.

Main Methods:

Longitudinal axonal imaging in mice to track inputs to M1 L2/3.
Optogenetics to identify and manipulate specific neuronal populations.
Behavioral training to establish expert motor skills in animals.

Main Results:

The motor thalamus was identified as a key input source encoding learned movements in expert mice.
Motor learning altered thalamic influence, leading to preferential activation of M1 neurons involved in learned movements.
Inactivation of thalamic inputs to M1 impaired learned motor skills in experts.

Conclusions:

Motor learning dynamically reshapes thalamic inputs to M1.
The motor thalamus plays a critical role in enabling reliable execution of learned movements.
This study elucidates a key mechanism by which the brain refines motor skills.