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Related Experiment Video

Updated: Dec 30, 2025

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BNST-insula structural connectivity in humans.

Elizabeth A Flook1, Brandee Feola2, Suzanne N Avery2

  • 1Department of Psychiatry and Behavioral Sciences, Vanderbilt University Medical Center, Nashville, TN, USA; Vanderbilt Center for Addiction Research, Vanderbilt University, Nashville, TN, USA.

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|January 20, 2020
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Summary
This summary is machine-generated.

This study reveals a structural connection between the bed nucleus of the stria terminalis (BNST) and the insula in humans, a pathway previously only shown in rodents. This finding is crucial for understanding psychiatric disorders.

Keywords:
Agranular insulaAnterior InsulaBNSTDTIStructural connectivity

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Area of Science:

  • Neuroscience
  • Human Brain Connectivity
  • Psychiatric Research

Background:

  • The bed nucleus of the stria terminalis (BNST) is implicated in anxiety, PTSD, and substance use disorders.
  • BNST network connectivity is vital for its function and behavior, as shown in rodent studies.
  • Structural connections between the BNST and insula have been documented in rodents but not yet in humans.

Purpose of the Study:

  • To investigate and confirm the existence of structural connections between the BNST and the insula in the human brain.
  • To map the specific subregions of the insula connected to the BNST.
  • To explore hemispheric and sex differences in BNST-insula connectivity.

Main Methods:

  • Utilized probabilistic tractography to analyze diffusion MRI data in humans.
  • Delineated the insula into anterior/posterior regions and eight cytoarchitectural subregions.
  • Examined structural connectivity between the BNST and these insular divisions.

Main Results:

  • Confirmed a significant structural connection between the BNST and the insula in humans.
  • Identified the strongest connectivity in the anteroventral insula, specifically within its agranular cortex.
  • Observed that BNST-insula connectivity varies between brain hemispheres and is influenced by sex.

Conclusions:

  • This study provides the first evidence of BNST-insula structural connectivity in humans, translating rodent findings.
  • The identified pathway, particularly to the anteroventral insula, is a critical network for future research.
  • These results establish a foundation for investigating the role of the BNST-insula pathway in psychiatric disorders.