Transverse temporal sulci

The transverse temporal sulcus marks the posterior border of the transverse temporal gyri, which are also referred to as Heschl's gyri. It stretches from medial to lateral and runs parallel to the transverse temporal gyri. This sulcus is not easily visible on the upper surface of the superior temporal gyrus because it is concealed beneath the frontal and parietal opercula. To observe it, one would have to remove the frontal and parietal lobes, revealing the upper surface of the temporal lobe. The transverse temporal sulcus holds significance as it demarcates the boundary of the primary auditory cortex.