Exploring the macaque precentral intragyral white matter using ultra-high field 11.7T dMRI

COEX 

Within the gyral white matter, three types of fibers converge: association, projection, and commissural. Currently, models of gyral white matter structural organization based on autoradiographic studies conducted in non-human primates (Schmahmann and Pandya, 2010; Dannhoff et al. 2023) describe their trajectory until the fibers arrive near the grey matter. However, there is little information characterizing their organization within the gyrus. The development of ultra-high field ex vivo MRI and advances in tractography algorithms, at the mesoscopic resolution, now allow us access to this intermingled fibers' organization. We sought to investigate the structural organization of white matter in the precentral gyrus (PrCG) of the macaque brain, using an ultra-high field 11.7T diffusion MRI dataset.