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Anatomical Components of Limbic system

Anatomical Components of Limbic system. Olfactory Pathway Amygdaloid complex Hippocampal formation Limbic lobe Septal nuclei Hypothalamus Mammillary bodies Ant Nu Thalamus Habenular nu Mid brain. Olfactory Pathway. Olfactory nerves Bulb Tract Pyriform area Ant perforated sub

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Anatomical Components of Limbic system

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  1. Anatomical Components of Limbic system • Olfactory Pathway • Amygdaloid complex • Hippocampal formation • Limbic lobe • Septal nuclei • Hypothalamus • Mammillary bodies • Ant Nu Thalamus • Habenular nu • Mid brain

  2. Olfactory Pathway • Olfactory nerves • Bulb • Tract • Pyriform area • Ant perforated sub • Para terminal gyrus

  3. Amygdaloid Complex

  4. Amygdaloid Complex • The amygdala is collections of nuclei • Situated in the roof of the inferior horn of lateral ventricle • Cortico-medial • Olfactory • Baso-lateral • Parahippocampal gyrus

  5. Striaterminalis • Is the sole efferent of Amygdaloid complex • Supra commissural • Septal nu • Commissural • Via ant comm opp amygdala • Sub commissural • Pre optic and ant nu of hypothalamus

  6. Function of Amygdaloid complex • Agonistic behavior • Aggression • Fear • Bilateral ablation of amygdala the animal exhibits loss of aggression • Docile • Occasional hypersexual behavior

  7. Papez Circuit Hippocampal Formation Cingulate Gyrus cingulum fornix thalamocortical radiation (Ant Limb of IC) Mammillary Body Anterior Thalamic Nuclei mammillothalamic tract

  8. Hippocampal formation • Hippocampus • Dentate gyrus

  9. Connections of hippocampus • Afferents • 1. from cingulated gyrus via cingulum • 2. from septal nuclei and indusium griseum retracing through the fornix. • 3. commissural fibers from the opposite hippocampus via the commissure of the fornix. • 4. profuse connection from the entorhinal area.(para-hippocampal gyrus ) • Efferents • the fornix forms the sole efferent projection fibers of the hippocampus

  10. Connections of the fornix. • Fibres of dorsal fornix make synapses with the neurons of gyrus fasciolaris, indusium griseum, cingulated gyrus and reach the septal nuclei of septum pellucidum through the fibres of corpus callosum. • Pre-commissural fornix provides connections to the paraterminal gyrus, pre-optic and anterior hypothalamic nuclei. • Fibres of post commissural fornix terminate in the anterior nucleus of thalamus. Other hypothalamic nuclei mammailary body and reach hebenullar nucleus via stria medularis thalami.

  11. Fear & Rage

  12. Hypersexual

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