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Ventral temporal-frontal pathways in the human brain based on diffusion MRI tractography.
Kep Kee Loh1, Kyriaki Neophytou2, Kristina Drudik3
1Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Canada; Department of Psychology, National University of Singapore, Singapore.
Neuroimage
|May 9, 2026
Summary
This study clarifies the human brain's Uncinate Fasciculus (UF) and Temporal-Frontal extreme capsule Fasciculus (TFexcF) pathways. Novel dMRI tractography defines their roles in memory, emotion, and attention.
Area of Science:
- Neuroscience
- Neuroanatomy
- Brain Connectivity
Background:
- Two ventral fiber pathways, the Uncinate Fasciculus (UF) and Temporal-Frontal extreme capsule Fasciculus (TFexcF), connect temporal and frontal cortices in primates.
- Previous definitions and reconstructions of these pathways in humans have lacked consistency, leading to conflicting functional interpretations.
Purpose of the Study:
- To precisely define and reconstruct the UF and TFexcF pathways in the human brain.
- To elucidate the functional roles of these pathways based on their anatomical interconnections.
Main Methods:
- Review of macaque monkey temporal-frontal connections from invasive tracer studies.
- Novel diffusion-weighted Magnetic Resonance Imaging (dMRI) tractography protocol for human brain reconstruction.
- Reconstruction based on anatomically defined cortical terminations.
Main Results:
- The Uncinate Fasciculus (UF) connects the orbitofrontal cortex with the anterior-medial temporal region, crucial for emotional processing and memory integration.
- The dorsal Temporal-Frontal extreme capsule Fasciculus (TFexcF) supports online monitoring within working memory and attentional allocation of processed sensory information.
- The ventral Temporal-Frontal extreme capsule Fasciculus (TFexcF) facilitates selective information retrieval by linking ventrolateral prefrontal cortex with anterior-to-middle temporal regions.
Conclusions:
- This study provides a clear definition and functional characterization of the UF and TFexcF in the human brain.
- The findings highlight the distinct roles of these pathways in higher cognitive functions, including emotion, memory, attention, and information retrieval.
