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The Limbic System Notes

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Lecture 41 The Limbic System

The Limbic Lobe (Broca, 1878) o Cingulate gyrus o Uncus (bump on parahippocampal gyrus) o Hippocampus o Parahippocampal gyrus (medial surfaces of temporal lobe) Circuit of Papez o Original model




 Hippocampal fibres go via fornix to mammillary bodies of hypothalamus
 MB project via mammillothalamic tract to anterior thalamic nuclei (AT)
 Fibres from AT project to cingulate gyrus via internal capsule
 White matter pathway; cingulum bundle from cingulate cortex to parahippocampal gyrus and then to hippocampus Function
 Thought to principally be involved in emotional processing but is NOT
 Expanded to include

• Septal Nuclei

• Ventral striatum

• Prefrontal cortex

• Amygdala
 Structure in circuit critical for MEMORY not emotion Present model

The Limbic system o Components (diverse set of cortical & subcortical structures; medial & ventral)
 Prefrontal cortex
 Parahippocampal gyrus; Hippocampus
 Septal nuclei and nucleus accumbens
 Amygdala
 Hypothalamus
 Thalamus

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