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Related Concept Videos

Cerebral Hemispheres01:05

Cerebral Hemispheres

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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Cerebrum: Anatomical Overview II01:11

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Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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Structural connectivity in children after total corpus callosotomy.

Cheng-Chia Lee1, Sheng-Che Hung2, Yi-Hsiu Chen3

  • 1Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Brain Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan.

Epilepsy Research
|March 29, 2022
PubMed
Summary

Total callosotomy significantly disrupts interhemispheric brain connectivity. However, white matter maintains structural connectivity within each hemisphere, suggesting resilience in intrahemispheric networks post-surgery.

Keywords:
Corpus callosotomyDeterministic fiber trackingGraph theoryNetwork-based statisticsStructural connectivity

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Brain Connectivity

Background:

  • The corpus callosum facilitates communication between brain hemispheres.
  • Understanding white matter structural changes after callosotomy is crucial for neurological research.

Purpose of the Study:

  • To investigate alterations in structural brain connectivity following total callosotomy.
  • To analyze changes in inter- and intrahemispheric white matter networks.

Main Methods:

  • Deterministic fiber tracking (tractography) of whole brain white matter was used.
  • Graph theory and network-based analysis were applied to 13 epilepsy patients pre- and post-callosotomy.
  • Clinical data on seizure patterns and outcomes were correlated with connectivity changes.

Main Results:

  • Total callosotomy significantly interrupted structural interhemispheric networks.
  • Intrahemispheric networks showed specific decreases in edges within each hemisphere (3 left, 2 right).
  • No significant global changes in intrahemispheric network density or efficiency were observed.

Conclusions:

  • Structural interhemispheric connectivity is significantly reduced post-callosotomy.
  • Intrahemispheric white matter structural connectivity is maintained, despite some edge decrements.
  • This suggests white matter's capacity to preserve intrahemispheric connections even after complete callosal disconnection.