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Dive Deeper into the Limbic System with Dr. Michael P. Gillespie

Explore the intricate components and functions of the limbic system in the brain with Dr. Michael P. Gillespie. Discover how this crucial system influences emotions, behavior, and memory formation, and learn about key structures like the hippocampus and amygdala. Uncover the role of the limbic system in motivation, pleasure, and more.

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Dive Deeper into the Limbic System with Dr. Michael P. Gillespie

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  1. Neuroscience Dr. Michael P. Gillespie Limbic System

  2. Limbic System • The limbic system is located deep within the core of the brain. • It is a source of our raw emotions before they are modulated by our frontal lobes. • It is a storehouse for long-term memories, particularly memories that have a strong emotional component. Dr. Michael P. Gillespie

  3. Parts of the Limbic System • Hippocampus • Amygdalae • Anterior thalamic nuclei • Septum • Limbic cortex • Fornix Dr. Michael P. Gillespie

  4. Functions of the Limbic System • Emotion • Behavior • Motivation • Long-term memory • Olfaction Dr. Michael P. Gillespie

  5. Functions • The limbic system includes the hypothalamus, amygdala, and the hippocampus. • These structures are involved in motivation, emotion, learning, and memory. • The limbic system is where the subcortical structures meet the cerebral cortex. • The limbic system operates by influencing the endocrine system and the autonomic nervous system. Dr. Michael P. Gillespie

  6. Functions continued… • The limbic system is highly interconnected with the nucleus accumbens, which is the brains pleasure center. • It plays a role in sexual arousal and the “high” derived from certain recreational drugs. • The basal ganglia in the limbic system direct intentional movements. This region also controls posture and movement. Dr. Michael P. Gillespie

  7. Limbic • “limbic” comes from the Latin limbus for “border” or “edge”. • The limbic system forms the inner border of the cortex. Dr. Michael P. Gillespie

  8. Hippocampus and Associated Structures • Hippocampus • Amygdala • Fornix • Mammillary body Dr. Michael P. Gillespie

  9. Hippocampus • Formation of long-term memories. • Cognitive maps for navigation. • If the hippocampus is damaged, a person cannot build new memories. Dr. Michael P. Gillespie

  10. Amygdala • Signals the cortex of motivationally significant stimuli related to reward and fear. • Participates in social functions such as mating. • Stimulates the hippocampus to remember details surrounding an event or situation. Dr. Michael P. Gillespie

  11. Fornix • Carries signals from the hippocampus to the mammillary bodies and septal nuclei. Dr. Michael P. Gillespie

  12. Mammillary Body • Important for the formation of memory. Dr. Michael P. Gillespie

  13. Septal Nuclei • Interconnections between areas of the limbic system. • Pleasure zone in animals. Dr. Michael P. Gillespie

  14. Limbic Node • Parahippocampal gyrus • Formation of spatial memory • Cingulate gyrus • Autonomic functions • Heart rate, blood pressure • Cognitive and attentional processing • Dentate gyrus • Helps to formulate new memories Dr. Michael P. Gillespie

  15. Additional Limbic Structures • Entorhinnal cortex • Memory and associative components • Piriform cortex • Olfactory system • Fornicate gyrus • Encompasses the cingulate, hippocampus, and parahippocampal gyrus • Nucleus accumbens • Involved in reward, pleasure, and addiction • Orbitofrontal cortex • Required for decision making Dr. Michael P. Gillespie

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