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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.
Olfactory stimuli enter the limbic loops via the entorhinal cortex of the parahippocampal gyrus. The limbic system has a direct influence on neuroendocrine, autonomic, and behavior mechanisms, and it also has a role in functions such as fight or flight, homeostasis, self-maintenance, appetite, and sexuality.