Heschl’s Gyrus will appear as a knob located on the superior portion of the STG. The tracing of Heschl’s Gyrus is done in the coronal view. Tracing begins at the appearance of the Transverse or Heschl’s sulcus (this will be the inferior boundary and the SF will be the superior boundary) from the anterior portion of HG to its posterior portion. (Fig. 1). Tracing continues until the gyrus disappears into the insular cortex (Fig. 2, Fig. 3 and Fig. 4). The sagittal view is used to check Heschl’s Gyrus boundaries (Fig. 5).
If there appears to be an initial single gyrus which divides into two branches when moving posteriorally, both branches were included as Heschl’s Gyrus (double gyrus).