Limbic and paralimbic system

SR NEUROSURGERY
SGPGIMS LUCKNOW

1. LIMBIC AND PARALIMBIC SYSTEM Dr. Yashveer Singh SR Neurosurgery

2. Historical aspect of Limbic system Thomus limbus-Cerebri limbus Paul Broaca -Limbic James papez-papez circuit Paul Maclean Limbic system

3. The term limbic is drived from Latin word LIMBUS for border or edege or in medical terminology it is a border of anatomical component. It is a functional anatomical system of interconnected cortical and subcortical structures Play a role in learning,emotion and autonomic r4egulation

4. Functional division of limbic system Rostral limbic system Caudal Limbic system Emotion Memory and Visual-spatial function Amygdala,Septum Orbitofrontal cortex Anterior Insula Anterior Cingulate Hippocampus Posterior parahippocampal formation Posterior cingulate

5. LIMBIC LOBE Vs LIMBIC SYSTEM LIMBIC LOBE (Cortical areas of limbic system) LIMBIC SYSTEM ( Limbic lobe+Nuclei+Connections ) 1-Parahippocampal gyrus 2-Hippocampus 3-Orbitofrontal cortex 4-Cingulate gyrus 5-Insula 1-Neuclei: Amygdala Septal Nueclei Mammillary body Anterior thalmus 2-Connections: Fornix Medial forebrain bundle Stria terminalis Mammilothalmic tract

6. Components of Limbic system Olfactory pathways Anterior perforated substance Pyriform lobe Septal area Amygdala Limbic cortex Hippocampal formation Elements of Diencephalon

7. Olfactory pathway

8. Anterior perforating substance

9. Pyriform lobe Principle region of awareness of olfaction Primary olfactory area Fiber from lateral ofcatory stria terminates from it

10. Septal area

11. Amygdala Known as Amyddaloid body or Amygdala Present near temporal pole of cerebellar hemisphere in close relation to anterior end of inferior horn of lateral ventricle. Superiorly it is closely related with anterior part of lentiform neucleus . It lies just below the anterior end of tail of the caudate neucleus . Lower end of stria terminalis lies in close relation of amygdaloid complex.

12. Functions of amygdala Learning Emotions Rewards Memory modulations Sexual orientation Social Intraction Agression,Fear,Anxiety,Feeding ,Drinking PTSD BPD

13. Limbic Lobe

14. Parahippocampal gyrus

15. Hippocampal formation

16. Hypothalmus

17. Papez circuit

18. Disorders of limbic system