- limbic system
- limbic system n a group of subcortical structures (as the hypothalamus, the hippocampus, and the amygdala) of the brain that are concerned esp. with emotion and motivation
* * *a complex system of nerve pathways and networks in the brain, involving several different nuclei, that is involved in the expression of instinct and mood in activities of the endocrine and motor systems of the body. Among the brain regions involved are the amygdala, hippocampal formation, and hypothalamus. The activities of the body that are governed are those concerned with self-preservation (e.g. searching for food, fighting) and preservation of the species (e.g. reproduction and the care of offspring), the expression of fear, rage, and pleasure, and the establishment of memory patterns. See also reticular activating system.
* * *a term loosely applied to a group of brain structures common to all mammals (including the hippocampus and dentate gyrus with their archaeocortex, the cingulate gyrus and septal areas, and the amygdala), associated with olfaction but of greater importance in other activities, such as autonomic functions and certain aspects of emotion and behavior; see also rhinencephalon.
Medical dictionary. 2011.