Limbic System
What does it do?
Emotion
Memory
Memory
Hippocampus
Facilitates forming memories
Structure
Enterorhinal cortex
Input via perforant path
Synapse with
Dentate gyrus
Ammon's horn CA3 region #
From various sources
Also synapse with ammon's horn CA3 region #
Long term potentiation
Leads to memory consolidation
Stimulus must be tetanic
Does not store memory though
Emotion
Location
All things around the 3rd ventricle
Medodorsal nucleu sof the thalamus
Ventral basal ganglia
Insular cortex
Hypothalamus
Amygdala
Cingulate gyrus
Anatomy
Formation and storage of memories with emotional events
Via long-term potentiation #
Basolateral amygdala
Central nucleus of the amygdala
Bed nuclei of stria terminalis
Physical fear responses
Immobility, tachycardia, increased RR, stress hormone release
Expression of emotional responses
Mediates release of CRH
Fear response
Appetitive (positive) conditioning
Pathway:
Cortex
Enterorhinal cortex
Dentate gyrus, CA3, CA1 via perforant pathway
CA3 via mossy fibers
CA1 via Schaffer cells
Subiculum #
Recurrent connections #
see look it makes a spiral like the hippocampus
Papez Circuit
Hippocampus
Fornix
Mamillary bodies
Thalamus #
forms emotional memories #
Cingulate Gyrus
Amygdalar circuit
Amygdala
Hypothalamus
Stria terminalis #
Emotions and homeostasis