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FIG 6. Diagrammatic representation of an axial section of the midbrain at the level of superior colliculus (modified from figure 54 of Duvernoy HM, The Human Brain Stem and Cerebellum, 1995, with permission of Springer-Verlag, Wien). Some of the structures affected in PSP have been reported. Other structures of the dorsal and cranial part of the midbrain affected in PSP (ie, nucleus interstitialis of Cajal and pretectal area) are located on the contiguous cranial section.
