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Schematic representation of the anatomy in an 85-year-old man shows the basal view of the OT and surrounding brain tissue in the left hemisphere. The whole length of the OT is exposed by removing the left temporal lobe. The tract is divided into three equal-sized portions: anterior, middle, and posterior. Numerous perforation points are present medial to (thick arrows) and through (thin arrows) the OT. These are mainly located in the middle and posterior portions of the OT.
