A, Coronal slice (1.5 mm) through the temporal lobe of a healthy control subject. The regions of interest for the structures are outlined: the gray matter of Heschl gyrus (HG) is red on subject left and green on subject right. The gray matter of planum temporale (PT) is labeled yellow on subject left and blue on subject right. B, Top-down view of the 3-dimensional reconstruction of HG and PT placed on top of an axial magnetic resonance imaging slice. Anterior is top. The HG is red on subject left and green on subject right, and PT is blue on subject left and yellow on subject right. C, Three-dimensional reconstruction of the left and right regions of interest, color coded as in section B but from a slightly different angle of rotation from that in section B. Note the tubular structure of the gray matter of the superior temporal gyrus, most clearly seen anteriorly, where gray codes non-HG, non-PT portions of superior temporal gyrus. D, Three-dimensional reconstructions viewed from a different angle from that in section C (D1 is subject right and D2 is subject left).