A name given by neuroscientist Paul MacLean to the region of the brain which includes the hippocampus, amygdala, anterior thalamic nuclei, septum, limbic cortex, and fornix. As part of his triune brain theory, MacLean hypothesized that the limbic system is older than other parts of the brain, and that it developed to manage fight-or-flight circuitry, which is an evolutionary necessity for reptiles, as well as humans.

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