BS545 - Limbic System
Terms
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- What is the general function of the limbic system?
- Anatomical substrate for drive-related and emotional behavior.
- Give three examples of drive-related behavior associated with the limbic system.
- eat, drink, reproduce
- What are the five functional components of the limbic system?
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Cingulated gyrus
Hippocampus
Parahippocampal gyrus
Amygdala
Septal nuclei - What is the purpose of the cingulated gyrus?
- Brings together motivation with physical action. It activates the limbic system.
- What is the purpose of the hippocampus?
- Involved in the formulation of long-term memory
- What is the purpose of the parahippocampal gyrus?
- Plays a part in memory and navigation.
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What is the purpose of the amygdala?
It's considered a substrate for what? -
Involved in fear and anger - both generation and recognition in others.
Empathy - What is the purpose for the septal nuclei?
- One area associated with pleasure.
- What sort of abnormalities are associated with injury to the amygdala?
- Loss of fear. "Emotional blunting - the creature may act rather placid.
- What sort of abnormaliteis are associated with injury to the hippocampus?
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Loss of declarative memory for new events.
Hyperactivity - Draw out the papez circuit
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See the drawing. - What does the septum feed?
- hypothalamus and frontal association cortex.
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What is damaged in the kluver-bucy syndrome?
What is a two word discription of the result of this damage? -
Amygdala, anterior hippocampus, portions of temporal lobe.
Behavior disorder - List the six signs and symptoms of a rhesus monkey showing the Kluver-Bucy syndrome.
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1) Loss of fear
2) Placidity
3) Visual agnosia (can't recognize familiar objects)
4) Tendency to examine all objects orally
5) Hypersexuality (indiscriminate)
6) Loss of emotional valence (loss of value) - What is damaged in Korsakoff's Psychosis? What causes it?
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Mammillary bodies.
Alcoholism - What is the result of Korsakoff's Psychosis?
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1) Anterograde amnesia
2) May show disorientation and confusion
3) Confabulation -
The limbic system is the ____ between ____ and ____.
Give the basic flow between the named elements. -
coordinator
Neocortex and hypothalamus/ANS
Neocortex <--> Limbic System <--> Hypothalamus - Name the four limbic system efferents plus one interlimbic connection of the amygdala to ___?
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hippocampus -> hypothalamus
amygdala-> hypothalamus
amygdala -> Septum (Basal fore brain)
Basal Forebrain (septum) -> Prefrontal Cx
Basal Forebrain (septum) -> hypothalamus - What are the four neocortex inputs to the limbic system?
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Frontal Association Cx -> Cingulate Gyrus
Parieto-occipital Cx -> Cingulate Gyrus
Temporal Association -> Amygdala
Temporal Association -> hippocampus - What is one major function of the temporal association cortex?
- Recognition of people and objects.