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