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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.
One way in which the limbic system has been conceptualized is as the feeling and reacting brain that is interposed between the thinking brain and the output mechanisms of the nervous system. In this construct, the limbic system is usually under control of the thinking brain but obviously can react on its own.