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The limbic system is a set of brain structures located on both sides of the thalamus, immediately beneath the cerebrum. It has also been referred to as the paleomammalian cortex. It is not a separate system but a collection of structures from the telencephalon, diencephalon, and mesencephalon.
What Is the Limbic System? Of all the areas of the brain, from an evolutionary perspective the limbic system is said to be one of the oldest and most primitive, having formed many hundreds of thousands of years ago. In fact, similar systems are also found in most other animals, even reptiles.