Cerebral Cortex Advance Access originally published online on December 8, 2004
Cerebral Cortex 2005 15(6):854-869; doi:10.1093/cercor/bhh186
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Cerebral Cortex V 15 N 6 © Oxford University Press 2004; all rights reserved
Segmentation of Subcomponents within the Superior Longitudinal Fascicle in Humans: A Quantitative, In Vivo, DT-MRI Study
1 Harvard Medical School Departments of Neurology and Radiology Services, Center for Morphometric Analysis, HST A. Martinos Center, Massachusetts General Hospital, Boston, MA 02129, USA, 2 Boston University School of Medicine, Department of Anatomy and Neurobiology, Boston, MA 02215, USA and 3 Harvard Medical School Departments of Neurology and Radiology Services, HST A. Martinos Center, Massachusetts General Hospital, Boston, MA 02129, USA
Address correspondence to Nikos Makris, Massachusetts General Hospital, Center for Morphometric Analysis, Building 149, 13th Street, Charlestown, MA 02129, USA.Email: nikos{at}cma.mgh.harvard.edu.
Previous research in non-human primates has shown that the superior longitudinal fascicle (SLF), a major intrahemispheric fiber tract, is actually composed of four separate components. In humans, only post-mortem investigations have been available to examine the trajectory of this tract. This study evaluates the hypothesis that the four subcomponents observed in non-human primates can also be found in the human brain using in vivo diffusion tensor magnetic resonance imaging (DT-MRI). The results of our study demonstrated that the four subdivisions could indeed be identified and segmented in humans. SLF I is located in the white matter of the superior parietal and superior frontal lobes and extends to the dorsal premotor and dorsolateral prefrontal regions. SLF II occupies the central core of the white matter above the insula. It extends from the angular gyrus to the caudal–lateral prefrontal regions. SLF III is situated in the white matter of the parietal and frontal opercula and extends from the supramarginal gyrus to the ventral premotor and prefrontal regions. The fourth subdivision of the SLF, the arcuate fascicle, stems from the caudal part of the superior temporal gyrus arches around the caudal end of the Sylvian fissure and extends to the lateral prefrontal cortex along with the SLF II fibers. Since DT-MRI allows the precise definition of only the stem portion of each fiber pathway, the origin and termination of the subdivisions of SLF are extrapolated from the available data in experimental material from non-human primates.
Key Words: association fiber pathway • cerebral cortex • DT-MRI • superior longitudinal fasciculus
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