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I want to know everything related to limbic system and its applied aspect give in utmost details as they are 30 marks question each

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This is a complete, exam-ready 30-mark answer synthesized from 6 major textbooks. Here is a brief orientation to help you navigate it:
What this answer covers:
Section 1-2: Introduction, etymology, and complete anatomy (cortical limbic lobe + all subcortical structures with a labeled diagram from Guyton)
Section 3: All major circuits in full detail - Papez circuit (with the exact sequence and white matter tracts), amygdala circuits (BLA vs centromedial; stria terminalis vs ventral amygdalofugal pathway), hypothalamic zones, medial forebrain bundle, and hippocampal tri-synaptic circuit
Section 4: Four functions (HOME mnemonic) - olfaction, emotion (Papez/amygdala/reward-punishment), memory (H.M. case, medial temporal + diencephalic systems, cholinergic basal forebrain), and homeostasis
Section 5 - Applied aspects (the clinical gold for 30-mark questions):
  1. Temporal lobe/limbic epilepsy (olfactory aura, uncinate fits, automatisms, mesial temporal sclerosis, surgery)
  2. Klüver-Bucy syndrome (causes, all 5 features with mechanism)
  3. Alzheimer's disease (entorhinal → hippocampal → cortical spread, cholinergic loss)
  4. Korsakoff syndrome (mammillary bodies, confabulation)
  5. Depression and DBS (BA25 sACC, lateral habenula)
  6. Anxiety/PTSD/GAD (amygdala hyperactivity, frontoamygdala connectivity)
  7. Schizophrenia (hippocampal hyperactivity → dopamine dysregulation)
  8. Herpes simplex encephalitis (limbic tropism, MRI findings, acyclovir)
  9. Bilateral hippocampal damage / amnesia syndromes
  10. Uncal herniation (CN III palsy - first sign, surgical emergency)
  11. Addiction (mesolimbic dopamine, VTA → nucleus accumbens)
  12. Rage/aggression (amygdalotomy)
  13. Sexual behavior and depersonalization
Sections 6-8: Master summary tables for quick revision
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