The hippocampus is one of the components of the brain. Its name comes from its shape, similar to that of the animal. It is located in the limbic system in the deep part of the brain in each hemisphere. The hippocampus plays a role in memory, regulation of behavior, and spatial cues. Among the pathologies affecting the hippocampus, Alzheimer's disease is a side-effect of the degeneration of many brain structures, including the hippocampus.