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Neuroanatomical Syst

Limbic System

TermsDefinition
Triune concept of McLean: Evolution and the Limbic System 1)Protoreptilian Brain: Instinct 2)Paleomammalian Brain: Limbic System –Emotion 3)Neomammalian Brain: Neocortex –Analytical Rasoning
Papez Circuit Hippocampus>(Fimbria Fornix)> Mamillary bodies> (Mamillothalamic tract)> Anterodorsal Thalamus> (Anterior Thalamic Radiations)> Cingulate Cortex > (Cingulum) > Parahippocampal Regions> (Perforant Pathway)
Nauta Septo-(preoptico)-hypothalamic-mesencephalic continuum
Current Conceptions of the Limbic System •Includes the amygdala •Modified Papez circuitry •Multiple and complex functions
Summary of Limbic Connections 1) Motivation (distributed in brain, includes hypothalamus and ANS) 2) Emotion (amygdala) 3) Memory (hippocampus)
Characteristics of Limbic Functions •Neither sensory nor motor but linked to both •Special links to autonomic and neuroendocrine(hypothalamus) systems •Have a cognitive component
Amygdala Zones *Basolateral: neocortical input, subcortical output. Role - memory, emotional significance of stimuli *Corticomedial:olfactory input, hypoth output. Role -feeding,appetite *Central:visceral sensory/motor, postparietal cortex. Role- auto responses to emo
Major Circuit through the HCF Entorhinal (via perforantpath to...) Dentate gyrus granule cells (mossy fiber pathway) CA3 pyramids (via Schaeffer collaterals to...) CA1 pyramids Subiculum Entorhinal (closes loop)
Major Inputs to Hippocampal Formation Cortical:Entorhinal cortex via perforant pathway (largest) Subcortical: Septum -Via the fornix -Cholinergic
Septal Nuclei A major fornix target(reciprocal cholinergic modulation w/ the hippocampus) Other connections with Hypothalamus, Amygdala, Cingulate cortex Self-stimulation hot spot (pleasure center)
Evidence for Cortical Role in Emotion •Irritability with sham rage implies tonic forebrain control •Emotion affects cognition and vice versa •PhineasGage •Cognition plays a role in our interpretation of affect
BarbasPaper: Prefrontal cortex and synthesis of Cognition, Memory, and Emotion •Lateral Prefrontal Areas: Early visual processing, Attention,Working memory •Orbitofrontal Areas: Late visual processing,Object memory •Limbic (medial) Prefrontal Areas: Emotional memory, Long-term memory
Created by: brown55
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