The limbic system is a vital part of the human body that is involved in various functions such as emotions, motivation, behavior, and memory. There are a few synonyms for the limbic system that are commonly used, including the paleomammalian cortex, the limbic lobe, and the limbic brain. While each of these terms tends to be used in different contexts, they all refer to the structures that make up the limbic system. The paleomammalian cortex highlights the early and primitive nature of this part of the brain, while the limbic lobe refers to the group of structures that are responsible for emotion and memory. The limbic brain, meanwhile, is the broader term that encompasses the various structures of the limbic system.