FIGURE 10-12 Human Auditory Cortex (A) The left hemisphere, showing the lateral fissure retracted to reveal the primary auditory cortex buried within Heschl’s gyrus; and adjacent secondary auditory regions. In cross section, the posterior speech zone (Wernicke’s area) is larger on the left, and Heschl’s gyrus is larger in the right hemisphere. (B) Frontal view showing the extent of the multifunctional insular cortex buried in the lateral fissure.