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Lateral Perspective of the Longitudinal Association Fibers

Surgical Correlation

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Lateral perspective of the cerebral longitudinal association fibers. The inferior longitudinal fasciculus (ILF) is the major occipitotemporal association tract that carries corticocortical association fibers between the anterior temporal lobe and the occipital lobe.  Recent studies suggest that the ILF consist of two parts: a "direct pathway" that is synonymous with the classically described, long-association fiber bundle, and an "indirect pathway" that consists of a chain of U-shaped associational fibers referred to as the occipitotemporal projection system.  The middle longitudinal fasciculus carries fibers from the temporal pole via the superior temporal gyrus white matter to the inferior parietal lobule and the angular gyrus. The superior longitudinal fasciculus carries fibers between ipsilateral cortices and is located lateral to the corona radiata and the claustrocortical fibers. The SLF is divided into three parts; SLF II is the major component and originates in the posterior parietal cortex and terminates in the dorsolateral prefrontal cortex. (Image courtesy of AL Rhoton, Jr.)

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