The superior longitudinal fascicle: reconsidering the fronto-parietal neural network based on anatomy and function
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REVIEW ARTICLE
The superior longitudinal fascicle: reconsidering the fronto-parietal neural network based on anatomy and function Riho Nakajima 1 & Masashi Kinoshita 2 & Harumichi Shinohara 3 & Mitsutoshi Nakada 2
# Springer Science+Business Media, LLC, part of Springer Nature 2019
Abstract Due primarily to the extensive disposition of fibers and secondarily to the methodological preferences of researchers, the superior longitudinal fasciculus (SLF) subdivisions have multiple names, complicating SLF research. Here, we collected and reassessed existing knowledge regarding the SLF, which we used to propose a four-term classification of the SLF based mainly on function: dorsal SLF, ventral SLF, posterior SLF, and arcuate fasciculus (AF); these correspond to the traditional SLF II, SLF III or anterior AF, temporoparietal segment of the SLF or posterior AF, and AF or AF long segment, respectively. Each segment has a distinct functional role. The dorsal SLF is involved in visuospatial attention and motor control, while the ventral SLF is associated with language-related networks, auditory comprehension, and articulatory processing in the left hemisphere. The posterior SLF is involved in language-related processing, including auditory comprehension, reading, and lexical access, while the AF is associated with language-related activities, such as phonological processing; the right AF plays a role in social cognition and visuospatial attention. This simple proposed classification permits a better understanding of the SLF and may comprise a convenient classification for use in research and clinical practice relating to brain function. Keywords Superior longitudinal fascicles . Arcuate fascicles . Anatomy . Imaging analysis . Neuropsychological function
Introduction The superior longitudinal fasciculus (SLF) is an extensive white-matter tract that mainly communicates between frontal and parietal lobes, and provides partial communication with the temporal lobe. It interconnects nearly all cortical areas of the lateral cerebral hemisphere. The frontoparietal network is
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11682-019-00187-4) contains supplementary material, which is available to authorized users. * Mitsutoshi Nakada [email protected] 1
Department of Occupational therapy, Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
2
Department of Neurosurgery, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa 920-8641, Japan
3
Department of Functional Anatomy, Kanazawa University, Kanazawa, Japan
involved in various functions that are essential for daily living, such as speaking, tool use, perspective taking, and empathy. The existence of the SLF has been known for more than 100 years, and the arcuate fasciculus (AF) has been regarded as part of the SLF. Since the 1980s and the methodological developmen
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