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| a hollow space within the body, an organ or a bone |
| a muscular, membranous or ligamentous wall separating the thoracic or chest cavity from the abdominal cavity in mammals |
limbic system n.
A group of deep brain structures, common to all mammals and including the hippocampus, amygdala, gyrus fornicatus, and connecting structures, associated with olfaction, emotion, motivation, behavior, and various autonomic functions.
| limbic system (lĭm'bĭk) Pronunciation Key
A group of interconnected structures of the brain including the hypothalamus, amydala, and hippocampus that are located beneath the cortex, are common to all mammals, and are associated with emotions such as fear and pleasure, memory, motivation, and various autonomic functions. |