The limbic system is a composite structure which lies in the temporal lobes of the brain and in the region of the thalamus. It is concerned with emotions and memory. The amygdaloid bodies are believed to be concerned with aggression. The hippocampus, lying above the parahippocampal gyrus, is concerned with memory. The septum pelucidum is thought to be associated with pleasure reactions. The cingulate gyrus, the fornix and the anterior commissure carry nerve fibers to and from other structures in the limbic system, as do the mammillary bodies, which are also vitally concerned with memory. These eight areas make up the complete limbic system.
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