a curved band of cortex lying within each cerebral hemisphere: in evolutionary terms one of the brain's most primitive parts. It forms a portion of the limbic system and is involved in the complex physical aspects of behaviour governed by emotion and instinct.
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a term used to denote the hippocampus in its entirety, including the hippocampus proper, dentate gyrus, and subiculum; used particularly when hippocampus is used to denote the hippocampus proper.Medical dictionary. 2011.