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Brain tractography. (a) Corpus callosum: fibre principal orientation is in the lateral direction (A, anterior; P, posterior; L, left; R, right). (b) Frontal and parietal lobe: fibre principal orientation is in the superior–inferior direction (A, anterior; P, posterior; S, superior; I, inferior). (c) Thalamus: fibre principal orientation is in the superior–inferior direction (A, anterior; P, posterior; S, superior; I, inferior).
