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Related Concept Videos

Direct Motor Pathways01:11

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 the...
Indirect Motor Pathways01:22

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...
Overview of Somatic Sensory Pathways01:29

Overview of Somatic Sensory Pathways

Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...
Spinal Cord: Cross-sectional Anatomy01:16

Spinal Cord: Cross-sectional Anatomy

The cross-sectional anatomy of the spinal cord offers a detailed view of its complex structure and function within the central nervous system. At the core of the spinal cord lies the gray matter, characterized by its butterfly or "H"-shaped appearance in cross-section. This central region is enveloped by white matter, with the overall structure divided into symmetrical halves by the dorsal median sulcus and the ventral median fissure.
Gray Matter and its Components
Central to the gray matter is...
Hierarchy of Motor Control01:18

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.

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Related Experiment Video

Updated: May 9, 2026

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
09:52

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

Published on: February 23, 2020

Neural pathways mediating cross education of motor function.

Kathy L Ruddy1, Richard G Carson

  • 1School of Psychology, Queen's University Belfast Belfast, UK ; Trinity College Institute of Neuroscience and School of Psychology, Trinity College Dublin Dublin, Ireland.

Frontiers in Human Neuroscience
|August 3, 2013
PubMed
Summary

Cross education enhances untrained limb performance through neural mechanisms like cross-activation or bilateral access. Understanding these processes is key for potential therapeutic applications.

Keywords:
bilateralinterhemisphericinterlimbmotor learningtransfer

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Area of Science:

  • Neuroscience
  • Motor Control
  • Rehabilitation Science

Background:

  • Cross education, where training one limb improves the other, has been studied for over a century.
  • The precise neural mechanisms underlying cross education are not fully understood.
  • Emerging evidence suggests therapeutic potential for cross education, necessitating a clearer mechanistic understanding.

Purpose of the Study:

  • To synthesize current knowledge on the neural mechanisms of cross education.
  • To evaluate existing explanatory frameworks, including cross-activation and bilateral access models.
  • To emphasize the role of task dependency in understanding cross education.

Main Methods:

  • Review and synthesis of existing literature on cross education.
  • Inclusion of recent findings from structural and functional brain imaging studies.
  • Analysis of mechanistic accounts within different task contexts.

Main Results:

  • Two primary theoretical frameworks exist: cross-activation and bilateral access.
  • Cross-activation models propose distributed neural activity during unilateral training.
  • Bilateral access models suggest motor engrams are utilized by both limbs' neural circuitry.

Conclusions:

  • Direct evidence delineating specific neural processes and their contributions is limited.
  • Task dependency is crucial for understanding the neural mechanisms of cross education.
  • Further research integrating neuroimaging and task-specific analysis is needed to elucidate cross education's mechanisms.