Brain Advance Access originally published online on February 9, 2007
Brain 2007 130(3):630-653; doi:10.1093/brain/awl359
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Association fibre pathways of the brain: parallel observations from diffusion spectrum imaging and autoradiography
1Department of Neurology, 2Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School and 3Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, MA, USA
Corresponding author: Jeremy D. Schmahmann, MD, Department of Neurology, Massachusetts General Hospital, CPZS-340, 55 Fruit Street, Boston MA 02114, USA E-mail: jschmahmann{at}partners.org
Understanding the long association pathways that convey cortical connections is a critical step in exploring the anatomic substrates of cognition in health and disease. Diffusion tensor imaging (DTI) is able to demonstrate fibre tracts non-invasively, but present approaches have been hampered by the inability to visualize fibres that have intersecting trajectories (crossing fibres), and by the lack of a detailed map of the origins, course and terminations of the white matter pathways. We therefore used diffusion spectrum imaging (DSI) that has the ability to resolve crossing fibres at the scale of single MRI voxels, and identified the long association tracts in the monkey brain. We then compared the results with available expositions of white matter pathways in the monkey using autoradiographic histological tract tracing. We identified 10 long association fibre bundles with DSI that match the observations in the isotope material: emanating from the parietal lobe, the superior longitudinal fasciculus subcomponents I, II and III; from the occipital-parietal region, the fronto-occipital fasciculus; from the temporal lobe, the middle longitudinal fasciculus and from rostral to caudal, the uncinate fasciculus, extreme capsule and arcuate fasciculus; from the occipital-temporal region, the inferior longitudinal fasciculus; and from the cingulate gyrus, the cingulum bundle. We suggest new interpretations of the putative functions of these fibre bundles based on the cortical areas that they link. These findings using DSI and validated with reference to autoradiographic tract tracing in the monkey represent a considerable advance in the understanding of the fibre pathways in the cerebral white matter. By replicating the major features of these tracts identified by histological techniques in monkey, we show that DSI has the potential to cast new light on the organization of the human brain in the normal state and in clinical disorders.
Key Words: tract tracing; tractography; fibre bundles; diffusion tensor imaging; isotope; disconnection
Abbreviations: AF, arcuate fasciculus; ASs, superior limb of the arcuate sulcus; CB, cingulum bundle; CC, corpus callosum; CS, central sulcus; DSI, diffusion spectrum imaging; DTI, diffusion tensor imaging; DWI, diffusion weighted image; EmC, extreme capsule; EPI, echoplanar imaging; FOF, fronto-occipital fasciculus; ILF, inferior longitudinal fasciculus; IPS, intraparietal sulcus; L In, limen insulae; MB, subcallosal fasciculus of Muratoff; MdLF, middle longitudinal fasciculus; RS, rostral sulcus; SLF, superior longitudinal fasciculus; SMA, supplementary motor area (M II); STS, superior temporal sulcus; UF, uncinate fasciculus
Received October 20, 2006. Revised November 21, 2006. Accepted November 28, 2006.
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