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Measures of Wallerian degeneration of the corticospinal tracts at the level of the cerebral peduncle (top) and medulla (bottom) were not strongly related to corpus callosum volume. Inset shows transverse cuts parallel to the bicommissural plane, with the superior cut at the level of the inferior colliculus (and through the cerebral peduncles), and the inferior cut at the medulla immediately below the pons. rrob = robust correlation estimate.
