Limbic System Flashcards
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homeostasis
olfaction
memory
emotion
limbic lobe
cingulate gyrus
parahippocampal gyrus
limbic system
anatomical substrate for drive-related and emotional behavior
neocortex
consciousness, perception
hypothalamus
autonomics
reciprocal input
with limbic system
-to neocortex and hypothalamus
components of limbic system
cingulate gyrus and cingulum parahipocampal gyrus - uncus hippocampus amygdala - deep to uncus septal region hypothalamus
septal region
basal forebrain
papez circuit
cingulate gyrus
hippocampus
hypothalamus
neocortex / limbic system / hypothalamus
papez circuitry
hippocampus to mamilary body
-mammilothalamic tract
mammilary body to anterior thalamic nucleus
anterior thalamic nucleus to cingulate cortex
cingulate cortex to entorhinal cortex
entorhinal cortex back to hippocampus
olfactory input to limbic system
hippocampus and amygdala
-small in humans
neocortical input to limbic system
temporal association cx
-hippocampus and amygdala
frontal association cx
and parieto-occipital cx
-cingulate gyrus
ouput of limbic system
from hippocampus and amygadala
- to hypothalamus
- then to basal forebrain
- then to prefrontal cortex
- conscious thoughts
also hypothalamus to autonomics and physiologic response
basal forebrain
gateway for limbic system flow to cortex
-lesion - very little limbic system to cortex
frontal lobotomy
instrument through orbit
-lesion basal forebrain
cuts off limbic sytem connection to cortex
no emotion to cortex
emotion
mental state with measureable physiologic parameters and observable behavior
feeling
subjective assessment of emotion
patient assessment
affect
conscious appreciation of emotion and outward expression
mood
sustained emotional state
-greater than weeks
basic emotions
fear anger happiness grief disgust
2 components of emotion
conscious feeling
-cortical
physiological change
-ANS, hypothalamus
emotion connections?
between neocortex, limbic system, hypothalamus
driven by sensory input**
somatic marker hypothesis
emotion starts with limbic systems response to INPUT
cortex creates cognitive responses
central role of amygdala
fear and anger
strong emotion - improved memory
ability to recognize emotions
primary input to amygdala
basolateral nucleus
primary output to amygdala
central nucleus
emotional memory
in amygdala
beta-adrenergic receptors
beta-blockers
to decreased PTSD
basal forebrain
decision making in regard to social behavior
loss of respect for social conventions
loss emotional knowledge
lesion of basal forebrain
prioritizing behavior in social context
basal forebrain
phineas gage
hit with railroad spike
-lost basal forebrain
modulatory systems
serotonin
NE
dopamine
ACh
