Limbic system
Please remember to read the functions of Hypothalamus since this also forms a part of the limbic system and the class has been taken separately
There are other areas in the structures near to the limbic system that are intimately connected to it – namely cingulate gyrus, basal ganglia, ventral tegmental area of the brain stem (just below the thalamus) and prefrontal cortex. So their functions are also needed to be studied alongwith this. LIMBIC SYSTEM
16th April, 2014
History
• Paul Broca (1824-1880):
1878: “le grand lobe limbique”
Refers to a ring of gray matter on the medial aspect of the cerebral hemispheres. • James Papez (1883-1958):
1930’s: defined a limbic system that might underlie the relationship between emotion and memory (Papez’ circuit).
Components
• Amygdaloid body
• Hippocampus
(“seahorse”)
• Cingulate gyrus
• Parahippocampal gyrus
• Hypothalamus
• Mamillary bodies
• Anterior nucleus of thalamus The Limbic System
Neurological Development and the Limbic System
R-Hemi closer connections to limbic system than L-Hemi.
R-Hemi develops earlier in infancy than L-Hemi
Emotions appear in babies before language
Emotionally expressive babies start talking later
When babies start to talk, don’t show emotion
13 mos—talk, no emotion
19 mos—talk + emotion
Functions
• “Emotional brain
Emotional and motivational aspects of behavior. Provides emotional component to learning process: Especially the amygdala.
• Associated with memory
Especially the hippocampus.
• Associated with pain/pleasure, rage
Amygdala
• Large nuclear group in temporal lobe.
• Afferents:
Olfactory tract
Solitary nucleus
Parabrachial nucleus
Limbic neocortex:
Cingulate gyrus
Parahippocampal gyrus
Amygdala Connections
Cerebral cortex
Olfactory system
Thalamus
Brainstem reticular formation
Stria terminalis Hypothalamus
AMYGDALA
Ventral Amygdalofugal fibers Regions of the Amygdala
•
There are other areas in the structures near to the limbic system that are intimately connected to it – namely cingulate gyrus, basal ganglia, ventral tegmental area of the brain stem (just below the thalamus) and prefrontal cortex. So their functions are also needed to be studied alongwith this. LIMBIC SYSTEM
16th April, 2014
History
• Paul Broca (1824-1880):
1878: “le grand lobe limbique”
Refers to a ring of gray matter on the medial aspect of the cerebral hemispheres. • James Papez (1883-1958):
1930’s: defined a limbic system that might underlie the relationship between emotion and memory (Papez’ circuit).
Components
• Amygdaloid body
• Hippocampus
(“seahorse”)
• Cingulate gyrus
• Parahippocampal gyrus
• Hypothalamus
• Mamillary bodies
• Anterior nucleus of thalamus The Limbic System
Neurological Development and the Limbic System
R-Hemi closer connections to limbic system than L-Hemi.
R-Hemi develops earlier in infancy than L-Hemi
Emotions appear in babies before language
Emotionally expressive babies start talking later
When babies start to talk, don’t show emotion
13 mos—talk, no emotion
19 mos—talk + emotion
Functions
• “Emotional brain
Emotional and motivational aspects of behavior. Provides emotional component to learning process: Especially the amygdala.
• Associated with memory
Especially the hippocampus.
• Associated with pain/pleasure, rage
Amygdala
• Large nuclear group in temporal lobe.
• Afferents:
Olfactory tract
Solitary nucleus
Parabrachial nucleus
Limbic neocortex:
Cingulate gyrus
Parahippocampal gyrus
Amygdala Connections
Cerebral cortex
Olfactory system
Thalamus
Brainstem reticular formation
Stria terminalis Hypothalamus
AMYGDALA
Ventral Amygdalofugal fibers Regions of the Amygdala
•