Abstract
The major language pathways such as superior longitudinal fasciculus (SLF) pathways have been outlined by experimental and diffusion tensor imaging (DTI) studies. The SLF I and some of the superior parietal lobule connections of the SLF pathways have not been depicted by prior DTI studies due to the lack of imaging sensitivity and adequate spatial resolution. In the current study, the trajectory of the SLF fibers has been delineated on five healthy human subjects using diffusion tensor tractography on a 3.0-T scanner at high spatial resolution. We also demonstrate for the first time the trajectory and connectivity of the SLF fibers in relation to other language pathways as well as the superior parietal lobule connections of the language circuit using high spatial resolution DTI in the healthy adult human brain.
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Abbreviations
- AF:
-
Arcuate fasciculus
- AG:
-
Angular gyrus
- BA:
-
Brodmann area
- Cing:
-
Cingulum
- DTI:
-
Diffusion tensor imaging
- DTT:
-
Diffusion tensor tractography
- DWI:
-
Diffusion-weighted imaging
- EmC:
-
Extreme capsule
- FA:
-
Fractional anisotropy
- FACT:
-
Fiber assignment by continuous tracking
- IFOF:
-
Inferior fronto-occipital fasciculus
- ILF:
-
Inferior longitudinal fasciculus
- IPL:
-
Inferior parietal lobule
- MD:
-
Mean diffusivity
- MdLF:
-
Middle longitudinal fasciculus
- ROI:
-
Region of interest
- SLF:
-
Superior longitudinal fasciculus
- SLF TP:
-
Temporoparietal portion of superior longitudinal fasciculus
- SMG:
-
Supramarginal gyrus
- SPL:
-
Superior parietal lobule
- UF:
-
Uncinate fasciculus
- WM:
-
White matter
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Acknowledgments
This work is funded by the American National Institutes of Health (NIH)-Institute for Neurological Diseases and Stroke (NIH-NINDS: R01-NS052505-04) and the Dunn Research Foundation. The purchase of the 3.0-T MRI clinical scanner was partially funded by NIH grant S10 RR19186 awarded to Dr. Ponnada A. Narayana. We wish to thank Vipul Kumar Patel for helping in data acquisition.
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Kamali, A., Flanders, A.E., Brody, J. et al. Tracing superior longitudinal fasciculus connectivity in the human brain using high resolution diffusion tensor tractography. Brain Struct Funct 219, 269–281 (2014). https://doi.org/10.1007/s00429-012-0498-y
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DOI: https://doi.org/10.1007/s00429-012-0498-y