1. LIMBIC SYSTEM

2. INTRODUCTION:
Limbic system is a complex system of cortical and subcortical
structure that form a ring around Hilus of cerebral hemisphere.
It is also known as limbic lobe (limbus– Ring )
Earlier, called as RHINONCEPHALON

3. PARTS :
• Archicortical :
• 1. Hippocampus
• 2. Dentate gyrus
• Paleocortical str. :
• 1. Piriform cortex
• 2. Olfactorylobe
• 3 Olfactory tubercle

4. PARTS :
• Juxtacortical str :
• 1. Lingulate gyrus of limbic cortex
• 2. Orbitoinsulotemporal cortex
• Subcortical str :
• 1. Amygdaiod
• 2. Septal Nucleus
• 3. Thalamic nuclei

5. CONTINUE
• 4. Hypothalamus Nucleus
• 5. Caudate Nuclei
• 6. Reticular formation of midbrain

6. FUNCTIONS
• 1. Olfacation : piriform cortex and Amygdaiod nucleus
form olfactory centre.
• 2. Regulation of endocrine gland : Hypothalamus regulates
Endocrine secretion
• 3. Regulation of autonomic functions : Hypothalamus
regulates autonomic functions – Heart rate , body
temperature, water balance, blood pressure.

7. CONTINUE
4.Regulation of food intake
5.Control of circadian rhythm : Hypothalamus plays major role in
Circadian fluctuation of various physiological activities.
6. Role in emotional state: Emotional state is maintained by
HIPPOCAMPUS + HYPOTHALAMUS.
7. Role in memory: Hippocampus + papez circuit role in memory.

8. CONTINUE
• Interconnection between various structure of limbic system which form
a complex circuit .
• Role in memory encoding.
•
• PAPEZ CIRCUIT: