A brief review of limbic system anatomy, function, and its clinical implication

Abstract

ABSTRACT Introduction: The limbic system, also known as the paleomammalian cortex, is a complex network of brain regions that plays a crucial role in our behavior, memory, and emotional experiences. Objective: This review aims to explore the structure, role, and clinical implications of the limbic system. It also seeks to understand how the concept of the limbic system has evolved over time, from Broca’s large limbic lobe to MacLean’s triune brain theory. Methods: The study involves an in-depth exploration of the limbic system’s constituent parts, including the limbic cortex, hippocampal formation, amygdala, septal area, and hypothalamus. It also examines the Papez and Yakovlev circuits, which are vital for emotion control. Result: The limbic system is involved in various processes, including long-term memory, spatial memory, autonomic function regulation, and the regulation of emotional reactions and behaviors. It is also essential for smell, hunger, sleep, dreams, and memory consolidation. The limbic system plays a significant role in several diseases, including epilepsy, limbic encephalitis, dementia, affective disorders, schizophrenia, KluverBucy syndrome, autism, attention deficit/hyperactivity disorder, Korsakoff’s psychosis, and anxiety disorders. Conclusion: Understanding the functional neuroanatomy of the limbic system is crucial for comprehending human behavior and its anomalies. This review updates the original Papez circuit and emphasizes the role of the limbic system in behavior and neuropsychiatric disorders. It provides valuable insights into a range of neuropsychiatric disorders.