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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...
Motor and Sensory Areas of the Cortex01:14

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 cortex.

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Related Experiment Video

Updated: May 10, 2026

Fiber Connections of the Supplementary Motor Area Revisited: Methodology of Fiber Dissection, DTI, and Three Dimensional Documentation
16:23

Fiber Connections of the Supplementary Motor Area Revisited: Methodology of Fiber Dissection, DTI, and Three Dimensional Documentation

Published on: May 23, 2017

Connectivity within the primary motor cortex: a DTI tractography study.

Elsa Magro1, Tristan Moreau, Romuald Seizeur

  • 1Service de Neurochirurgie, CHRU Cavale Blanche, 29200, Brest, France, elsa.magro@chu-brest.fr.

Surgical and Radiologic Anatomy : SRA
|July 4, 2013
PubMed
Summary
This summary is machine-generated.

This study reveals novel white matter connections within the precentral gyrus using MRI tractography. These reproducible findings detail intra-gyral connectivity in both hemispheres, offering new insights into motor cortex organization.

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Area of Science:

  • Neuroscience
  • Neuroimaging
  • Human Anatomy

Background:

  • The primary motor cortex, located in the precentral gyrus, is crucial for motor function.
  • While white matter connections *of* the primary motor cortex are well-studied using diffusion tensor imaging (DTI), intra-gyral connectivity remains underexplored.

Purpose of the Study:

  • To investigate and characterize the white matter connections *within* the precentral gyrus.
  • To explore the pattern of intra-gyral connectivity in healthy subjects using advanced neuroimaging techniques.

Main Methods:

  • Utilized T1 magnetic resonance imaging (MRI) for anatomical parcellation of the precentral gyri in 20 healthy subjects.
  • Employed MRI tractography to reconstruct and analyze white matter tracks within the precentral gyrus.
  • Corroborated findings through classical dissection of post-mortem brain tissue.

Main Results:

  • Identified and visualized MRI tracks connecting different regions within the same precentral gyrus.
  • Demonstrated the reproducibility of these intra-gyral connections in both left and right hemispheres across all subjects.
  • Quantitatively described the bilateral distribution of these tracks, analyzing asymmetry and its relation to handedness.

Conclusions:

  • This study presents the first detailed description of intra-precentral gyrus white matter connectivity in the literature.
  • The functional significance of this newly detailed connectivity pattern warrants further investigation.