First, we used published tracer data to guide our reconstruction of tracts connecting amygdala and rostral temporal areas with prefrontal cortex (PFC) in macaques.
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Using non-invasive diffusion MRI and tractography we identified the anatomy and PFC connectivity of the amygdalofugal pathway and uncinate fascicle.
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Using an approach guided by tracer data allowed us to limit potential artifacts arising by the complex course of these pathways in forebrain and orbitofrontal areas.
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We then used the macaque pathways to identify the amygdalofugal and uncinate paths in the human brain.
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The two paths are anatomically organized along a medial-lateral axis in the forebrain and caudal PFC but converge together in more rostral orbitofrontal areas.
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In rostral PFC, however, the two tracts connect with slightly different portions of frontopolar cortex.
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The PFC projections of amygdalofugal and uncinate are preserved across humans and macaques, although minor differences could be observed.
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Human amygdalofugal and uncinate are well dissociable from internal capsule, cingulum bundle, extreme capsule, fornix and stria terminalis.
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All data are open access. For both macaques and humans, tractograms and masks relative to the tracts part of the study are available on the
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