Limbic system - Lecture 7

Question 1

what is the limbic system composed of

Answer 1

parts of the brain underlying emotional behavior

Question 2

what is the limbic system associated w/

Answer 2

the olfactory system

rhinencephalon = smell brain

Question 3

where is the limbic lobe

Answer 3

medial surface of the mammalian brain

right underneath the cortex

Question 4

what is the limbic lobe composed of

Answer 4

several nuclei of gray matter

Question 5

what does the limbic lobe form

Answer 5

border around the brain stem

Question 6

what does the limbic system include

Answer 6

phylogenetically ancient cortical areas

a group of associated subcortical nuclei

associated pathways that interconnect different brain areas

Question 7

major fxn of the limbic lobe

Answer 7

modulate hypothalamus

Question 8

other fxns of the limbic lobe

Answer 8

species preservation

self preservation

expression of fear and motivation

memory and learning

Question 9

species preservation

Answer 9

reproduction and associated instinctive behavior

Question 10

self preservation

Answer 10

feeding behavior and aggression

Question 11

what does the limbic system command

Answer 11

behaviors that are necessary for survival of all mammals

Question 12

what does the limbic system give rise and modulated

Answer 12

specific fxns that allow animals to distinguish b/w the agreeable and disagreeable

Question 13

specific affective fxns originated in the limbic system

Answer 13

instinct to protect

emotions and feelings

Question 14

what is the limbic system also responsible for

Answer 14

some aspects of personal identity

important fxns related to memory

Question 15

major components of the limbic system

Answer 15

hippocampal formation

amygdala

cingulate gyrus

Question 16

hippocampal formation

Answer 16

involved in the consolidation of short-term memory into long term memory

Question 17

amygdala

Answer 17

regulated emotional expression via modulation of hypothalamus

Question 18

where is the hippocampus

Answer 18

stretches from middle of the brain down into the temporal lobes

ending adjacent to the amygdala

Question 19

what does the hippocampus receive

Answer 19

highly processes sensory info about internal and external events

perforant pathway

fimbria-fornix

Question 20

perforant pathway

Answer 20

hippocampus is reciprocally connected to the entorhinal cortex

Question 21

entorhinal cortex

Answer 21

has connections with other cortical areas

visual, auditory info

Question 22

fimbria fornix

Answer 22

hippocampus is also reciprocally connect to septum, thalamus and hypothalamus

Question 23

pathways that allow for intrahippocampal connections

Answer 23

commissural connections

schaffer collaterals

Question 24

commissural connections

Answer 24

neuronal connections made b/w neurons in 2 hippocampi

Question 25

schaffer collaterals

Answer 25

connections b/w neurons made on one side of hippocampus

Question 26

how can the hippocampus send axons

Answer 26

directly to the hypothalamus and mamillary bodies via the fornix

pass along info back to entorhinal cortex –> relay it all back to sensory cortex

Question 27

what is the hippocampus essentially

Answer 27

one continuous pathway

begins in the sensory cortex, transverses the hippocampus and returns to the sensory cortex

Question 28

what is the fornix

Answer 28

group of fibers that arises from each hippocampus and project to the contralateral hippocampus

Question 29

what does the fornix link

Answer 29

rhinencephalon to both the thalamus and the hypothalamus

Question 30

what is the fornix connected to

Answer 30

septal nuclei

mamillary bodies

anterior nucleus of the thalamus

Question 31

hippocampus fxns

Answer 31

particularly involved with memory

specifically with the formation of long-term memory

Question 32

when both hippocampi are destroyed

Answer 32

nothing can be retained in the memory

subject quickly forgets any recently received message

Question 33

intact hippocampus

Answer 33

allows the animal to compare the conditions of a present threat with similar past experiences

enabling one to choose the best option in order to guarantee its own survival