Rhythm of Memory (IMAGE) University of Freiburg Caption The hippocampus is essential to the memory and learning. This picture shows its characteristic form. The interneurons are highlighted in green, "Ammon's horn" (CA3), as the hippocampus is also known, and the dentate gyrus (DG) are outlined in white. Credit Source: Marlene Bartos Usage Restrictions The image may only be used with appropriate caption or credit. 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.