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Organization of the posterior part of the inferior frontal gyrus, including the pars orbitalis (Por), pars triangularis (PTr), and pars opercularis (Pop) separated by the horizontal (hSF) and ascending (aSF) branches of the SF. iFS: inferior frontal sulcus; iPCS: inferior precentral sulcus; CS: central sulcus; PoCS: postcentral sulcus.
