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The limbic system

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The limbic system

  1. 1. THE LIMBIC SYSTEM<br />By:<br />Amuthameena A/P Manoharan<br />Jayaganthan A/L Maunagar<br />Thiaggu A/L Palan<br />Muhammad Zahir B. MohdSabri<br />
  2. 2. HIGHLIGHTS<br />Definition<br />Anatomical structures<br />Connecting pathways<br />Afferent connections of the hippocampus<br />Efferent conections of the hippocampus<br />Functions<br />
  3. 3. The Limbic System<br />Used to include a group of structures that lie in the border zone between the cerebral cortex and the hypothalamus.<br />Controls behaviour, emotion, and drive; also appears to be important to memory.<br />
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  5. 5. Anatomical Structures<br />Subcallosal<br />Cingulategyrus<br />Parahippocampalgyrus<br />Hippocampal formation<br />Amygdaloid nucleus<br />Mamillary bodies<br />Anterior thalamic nucleus<br />
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  7. 7. Connecting Pathways<br />Alveus<br />Fimbria<br />Fornix<br />Mammillothalamic tract<br />Striaterminalis<br />
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  11. 11. Afferent Connections of the Hippocampus<br />Cingulategyrus pass to the hippocampus.<br />Septal nuclei (nuclei lying within the midline close to the anterior commissure) pass posterior in the fornix to the hippocampus<br />One hippocampus pass across the midline to the opposite hippocampus in the commissure of the fornix.<br />Indisiumgriseum pass posteriorly in the longitudinal striae to the hippocampus.<br />Entorhinal area or olfactory-associated cortex pass to the hippocampus.<br />Dentate and parahippocampalgyri travel to the hippocampus.<br />
  12. 12. Efferent Connections of the Hippocampus<br />Posterior to the anterior commissure to enter the mammillary body, end in the medial nucleus.<br />To end in the anterior nuclei of the thalamus.<br />To enter the tegmentum of the midbrain<br />To end in the septal nuclei, the lateral preoptic area, and the anterior par of the hypothalamus.<br />Fibers join the striamedullaris thalami to reach the habenular nuclei.<br />
  13. 13. Functions of the Limbic System<br />Control the endocrine system; able to influence many aspects of emotional behaviour (fear, anger, sexual, etc.).<br />Converting recent memory to long-term memory<br />Integration and effective homeostatic responses to a wide variety of environmental stimuli.<br />
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  16. 16. Clinical Notes on The Limbic System<br />SCHIZOPHRENIA<br /><ul><li>include chronically disordered thinking, blunted effect and emotional withdrawal.
  17. 17. paranoid delusions and auditory hallucinations may also be present.</li></ul>DESTRUCTION of the AMYGDALOID COMPLEX<br /><ul><li>decreased aggressiveness, emotional instability and restlessness; increased interest in food and hypersexuality.
  18. 18. Kluver-Bucy Syndrome</li></ul>TEMPORAL LOBE DYSFUNCTION<br />- preceded by an aura of acoustic or olfactory experience.<br /><ul><li>often confused, anxious, and docile.
  19. 19. May perform automatic and complicated movements; and then have no memory of what occurred previously.</li></li></ul><li>THANK YOU<br />

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