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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.
In the alligator, the limbic system is heavily involved in smell and plays an important role in defending territory, hunting and eating prey. In humans, the limbic system is more involved in motivation and emotional behaviors.