Limbic System/Emotions Flashcards Preview

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Flashcards in Limbic System/Emotions Deck (12):
1

Fornix

Connects hippocampus to mamillary bodies

2

Dentate Gyrus

In hippocampus, involved w/ LTP

3

Amygdala

Has different nuclei that receive sensory inputs (cortex/thalamus) and memory (hippocampus), then sends it out to various places so you have an experience and then generate an emotional response to it

4

Papez Circuit (circuit 7/8 and role)

Involved in limbic regulation
Hippocampus -> fornix -> mamillary body -> mammillothalamic tract -> anterior thalamic nucleus -> thalamocortical fibers -> cingulate gyrus -> direct feedback to hippocampus

5

Reward/Emotion Pathway of Limbic System

VTA --> nucleus accumbens -> prefrontal cortex -> amygdala
Basically get sensory input and motor outputs

6

Piriform and entorhinal cortex

Olfactory stuff projects here, older part of cortex

7

2 Halves of Hippocampus

Dominant (left): verbal memory
Nondominant (right): spatial memory

8

Bilateral Ablation of Hippocampus

Anterograde amnesia

9

5 Functions of Amygdala

Startle reflex/fight or flight
Regulate mood/aggression/behaviors/social, etc
Social/emotional meaning to sensory info
Emotional memories
Recognition of fear

10

Kluver-Bucy Syndrome (what it is and 4 effects)

Bilateral amygdala ablation
1. Placid/tame/flattened emotions
2. Nonaggressive behavior - inability to recognize fear
3. Visual agnosias (don't understand what they're seeing)
4. Hyperorality and sexuality

11

Korsakoff Syndrome (what it is, 3 symptoms)

Vitamin B1 deficiency from alcoholism causes bilateral lesions in mamillary bodies
1. Anterograde amnesia/apathy/confabulation
2. Ophthalmoplegia - weakness/paralysis in eye muscles
3. Wide stance gait

12

2 Effects of Prolonged Stress

Amygdala has new branches w/ fear and panic
Hippocampus - neural degeneration and memory loss