Auditory Cortex (IMAGE) Society for Neuroscience Caption Development of the left hemisphere temporal plane from 28 weeks to 40 weeks PMA. Heschl's gyrus (demarcated with white dashed lines) is forming by 28 weeks PMA and has an adult-like appearance by 40 weeks PMA. Primary and nonprimary auditory cortex are located in medial and lateral Heschl's gyrus, respectively. PMA=postmenstrual age; HG=Heschl's gyrus. Credit Monson et al., <em>eNeuro</em> (2018) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.