A population-normalized tractographic fiber atlas of the anterior limb of the internal capsule: relevance to surgical neuromodulation

Garrett P. Banks, Sarah R. Heilbronner, Wayne Goodman, Sameer A. Sheth

Research output: Contribution to journalArticlepeer-review

Abstract

OBJECTIVE The anterior limb of the internal capsule (ALIC) is a white matter highway that connects several subcortical structures to the prefrontal cortex. Although surgical interventions in the ALIC have been used to treat a number of psychiatric illnesses, there is significant debate regarding what fibers are targeted for intervention. This debate is partially due to an incomplete understanding of connectivity in the region. METHODS To better understand this complex structure, the authors employed a novel tractography-based approach to examine how fibers from the thalamus and subthalamic nucleus (STN) traverse the ALIC. Furthermore, the authors analyzed connections from the medial dorsal nucleus, anterior nucleus, and ventral anterior nucleus of the thalamus. RESULTS The results showed that there is an organizational gradient of thalamic fibers medially and STN fibers laterally in the ALIC that fades more anteriorly. These findings, in combination with the known corticotopic organization described by previous studies, allow for a more thorough understanding of the organization of the white matter fibers in the ALIC. CONCLUSIONS These results are important for understanding and targeting of neuromodulatory therapies in the ALIC and may help explain why differences in therapeutic effect are observed for different areas of the ALIC.

Original languageEnglish (US)
Pages (from-to)1278-1288
Number of pages11
JournalJournal of neurosurgery
Volume137
Issue number5
DOIs
StatePublished - Nov 2022

Bibliographical note

Funding Information:
We thank the Human Connectome Project team, whose data were necessary and instrumental to this study.

Publisher Copyright:
© AANS 2022.

Keywords

  • anterior limb of the internal capsule
  • functional neurosurgery
  • psychiatric neurosurgery
  • stereotactic neurosurgery
  • tractography

PubMed: MeSH publication types

  • Journal Article

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