Neuroanatomical Syst Word Scramble
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Terms | Definition |
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 |
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brown55
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