Section 7 Limbic System Flashcards Preview

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Flashcards in Section 7 Limbic System Deck (31):
1

Functions of the limbic system

motivation, drive, emotions
memory, emotional learning and behavior, reward

2

definition of limbus

latin for "border"

3

limbic lobe location

ring of cortex on the medial surface of the brain that spans across aspects of the frontal, parietal, and temporal lobes.

4

components of limbic system

cortex and subcortical structures

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cortex structures

cingulate gyrus
subcallosal gyrus
parahippocamual gyrus
entorhinal cortex
uncus

6

subcortical structures

hippocampus
amygdala
septal nuclei

7

papez circuitry

1. links limbic systems with each other and with specific cortical areas
2. provides a neural substrate for emotional behavior

8

the circuit of the papez circuitry

hippocampus->
fornix->
mammillary bodies->
mammillothalamic tract->
anterior nucleus of thalamus->
cingulate gyrus->
back to hippocampus

9

short term memory

"working memory"
a function of the prefrontal cortex

10

long term memory

2 forms:
explicit and implicit

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explicit long term memory

"declarative memory"
recalling facts (semantic memory) and events (episodic memory)
Involves the hippocampus, entorhinal cortex, parahippocampal gyrus

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implicit long term memory

"nondeclarative memory" memories that manifest as a subconscious or physiology response to events or stimuli
3 types: 1. skills and habits,
2. emotional memory,
3. conditioned reflexes

13

skills and habits

the learning that occurs during performance of a task
Involves the striatum, cerebellum, and motor areas of the cortex

14

emotional memory

a change in behavior toward a previously neutral stimulus as a result of experience
involves the amygdala

15

conditioned reflexes

pavlov's dog
directed by the cerebellum

16

hippocampus

resembles a seahorse shape
translates to "mythical sea creature"
located in temporal lobe
forms floor of 3rd ventricle
involved with learning and formation of new memories
explicit/declarative memory= facts and events

17

3 components of the hippocampus

subiculum
hippocampus proper (ammon horn)
dentate gyrus

18

amygdala

almond shaped
located in the prefrontal cortex
emotional learning
reward and fear
medial temporal lobe to amygdala

19

3 groups of nuclei in amygdala

basolateral nuclei
central nuclei
corticomedial nuclei

20

basolateral nuclei

largest group
attaching emotional significance to a stimulus

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central nuclei

regulates visceral responses to emotional stimuli

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corticomedial nuclei

olfactory association emotional affective response to food

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functions of the amygdala

1. emotional learning and memory
2. fear and fear conditioning
3. reward

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reward circuitry is driven by

dopamine

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septal nuclei

small group of nuclei in the medial wall of the frontal lobe
contains cholinergic neurons

26

hypothalamus

interconnected with all the limbic structures, controls efferent info
can influence visceral activity

27

ventral striatum

reward center

28

anterior and dorsal nuclei of thalamus

learning , alertness, episodic memory

29

ventral tegmental area

group of neurons near the floor of midbrain
contains cell bodies of dopaminergic neurons
involved in reward circuitry
important in:
1. cognition
2. motivation
3. orgasm
4. drug addiction
5. intense emotions relating to love
6.several psych disorders

30

periaquetal gray

AKA central gray
primary control center for descending pain modulation
suppresses pain by enkephalin-producing cells

31

2 other areas connected to limbic system

prefrontal cortex
olfactory system