8/6/2019 Functions of Limbic System

1/1

unc ons o m c ys em

Limbic Lobe

Limbic SystemArea of brain that regulates emotion, memory

Directly connects lower, higher brain functions

A Cingulate gyrus

B Fornix

C Anterior thalamic nuclei

D Hypothalamus

E Amygdaloid nucleus

F Hippocampus

Emotions

Complex psychophysiological experience (state of mind)

Interacting withy Biochemical (internal)y Environmental (external)Involves

y Physiological arousaly Expressive behavioursy Conscious experienceAssociated with

y Moody Temperamenty Personalityy Dispositiony MotivationTheories Formation of Emotions

James-Lange Theory

Man perceives frightening animal

Reacts with physical (neurovegetative) manifestations

Develops fear

Cannon-Bard Theory

Faces an event, nervous impulse travels straight to thalamus

Message divides toy Cortex (originate subjective experiences fear, rage, sadness, joy)y Hypothalamus (determine peripheral neurovegetative changes)Occur simultaneously

y Physiological reactionsy Emotional experiencePapezs Circuit of Fear

Hippocampo-mammillo-cortical circuit

y Feeling of feary Physiological arousalMcLeans Limbic System

Emotional brain includes Papezs circuit and

y Prefrontal cortexy Parahippocampal gyrusy Amygdalay Medial thalamic nucleusy Reticular formation

MacLeans Triune Brain

The R-complex

Limbic system

Neocortex

Limbic System (Emotional Brain)

Controls

y Emotional behavioury Motivational drivesMajor Components

Subcortical Limbic Cortical Limbic

HippocampusAmygdala

Septal area

Hypothalamus

Mamillary bodies

Anterior thalamic nucleus

Medial forebrain bundle

Prefrontal lobe

Other areas, pathways of brain

Cingulate gyrusParahippocampal gyrus, uncus

Prefrontal, orbitofrontal cortex

Subcallosal gyrus

Function of Limbic System

Emotions (fear, rage, anxiety, aggression)Reinforcement, reward

Feeding behaviour

Sexual, maternal behaviour

Memory