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Occipital white matter tracts in human and macaque

By Hiromasa Takemura, Franco Pestilli, Kevin S. Weiner, Georgios A Keliris, Sofia M Landi, Julia Sliwa, Frank Q. Ye, Michael A Barnett, David A. Leopold, Winrich A Freiwald, Nikos K Logothetis, Brian Wandell

Posted 27 Aug 2016
bioRxiv DOI: 10.1101/069443 (published DOI: 10.1093/cercor/bhx070)

We compare the major white matter tracts in human and macaque occipital lobe. The comparative anatomy of human and macaque occipital white matter tracts reveals both similarities and significant differences in spatial arrangement and relative sizes of the tracts. There are several apparently homologous tracts in the two species, including the vertical occipital fasciculus (VOF), optic radiation, forceps major, and inferior longitudinal fasciculus. There is one large human tract, the inferior occipital-frontal fasciculus, with no corresponding fasciculus in macaque. The macaque VOF is compact and its fibers intertwine with the dorsal segment of the ILF, but the human VOF is much more elongated in the anterior-posterior direction and its fibers do not intertwine with the ILF. These similarities and differences will be useful in establishing which circuitry in the macaque can serve as an accurate model for human visual cortex.

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