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 />
HIGHLIGHTS<br />Definition<br />Anatomical structures<br />Connecting pathways<br />Afferent connections of the hippocampus<br />Efferent conections of the hippocampus<br />Functions<br />
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 />
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 />
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 />
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 />
Clinical Notes on The Limbic System<br />SCHIZOPHRENIA<br /><ul><li>include chronically disordered thinking, blunted effect and emotional withdrawal.
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.
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.
May perform automatic and complicated movements; and then have no memory of what occurred previously.</li></li></ul><li>THANK YOU<br />