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Flashcards in Limbic system Deck (25):
1

What is the overreaching function of the limbic system?

Assign value to emotions or sensory events

2

How many layers is the hippocampal formation?

3

3

What are the 3 layers of the hippocampal formation?

- Dentate gyrus
- Hippocampus proper
- Subiculum

4

What is the name of the circuit that predates the modern concept of the limbic system?

Papez circuit

5

What is the papez circuit?

- Cinguate gyrus
- Hippocampus
- Fornix
- Hypothalamus - Mamillary bodies
- Thalamus
- Cortex

6

What is the function of the hippocampal formation?

- Formation of new memories and learning

7

What results from removal of the hippocampal formation?

Anterograde amnesia

8

What is anterograde amnesia?

Profound loss of recent or short-term memory and the ability to learn

9

What is retrograde amnesia?

Loss of memories from before the date of injury

10

Where is the amygdaloid nucleus located?

Deep to the uncus

11

What is the major afferent modality to the amygdaloid?

Smell

12

What is the major function of the amygdaloid?

- Programs appropriate behavioral/ emotional responses
- Puts affective value on stimuli

13

What happened in animals when the amygdaloid was stimulated?

Became more aggressive

14

What happening in animals when the amygdala was removed?

- Indifferent to stimuli that would have caused fear or sexual responses

15

What are the 3 functions of the central nuclei of the amygdala?

- Mediate emotional response
- Regulate autonomic nervous system
- Shape responses to emotional stimuli

16

What nuclei of the amygdala are the major division that attach emotional significance to stimuli?

- Basolateral nuclei

17

What 3 structures do the basolateral nuclei of the amygdala project to?

- Frontal lobe
- Thalamus
- Temporal lobe

18

What is the function of the cortical nuclei of the amygdala?

- Perception of smell
- Behavioral link to smell

19

What occurs when the septal region of the amygdala is stimulated in conscious patients?

Feelings of:
- Pleasure
- Optimism
- Euphoria
- Happiness

20

What centers are found in the septal region?

Orgasm centers

21

What structure does the septal region of the amygdala connect with in the reward system?

hypothalamus

22

What is the main projection of the septal region?

Reticular formation of the brain stem

23

What 2 structures does the cingulate gyrus connect?

The hippocampus and thalamus

24

What is the function of the anterior cingulate cortex in each of the following anatomic areas:
- Anterior
- Posterior
- Dorsal
- Ventral

- Anterior: Executive
- Posterior: Evaluative
- Dorsal: Cognitive
- Ventral: Emotional

25

How is the anterior cingulate cortex related to learning?

- Helps focus when effort is needed to learn:
Assists in:
- Error detection
- Anticipation of tasks
- Motivation
- Modulation of emotional responses