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Cortical Structures of the Limbic System

Cortical Structures of the Limbic System. Most notable structures Primary function Orbitofrontal gyri Very diverse Cingulate gyrus Emotion Isthmus Emotion + Memory Parahippocampal gyrus Memory Uncus Olfaction. Subcortical Structures of the Limbic System.

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Cortical Structures of the Limbic System

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  1. Cortical Structures of the Limbic System Most notable structuresPrimary function Orbitofrontal gyriVery diverse Cingulate gyrus Emotion Isthmus Emotion + Memory Parahippocampalgyrus Memory Uncus Olfaction

  2. Subcortical Structures of the Limbic System Most notable structures: Septal nuclei Nucleus accumbens Mammillary body Amygdala Dorsal thalamus Habenula Hippocampal formation Most notable efferent pathways: Fornix Striaterminalis Ventral amygdalofugal Mammilothalamic

  3. Hippocampal Formation Afferent Pathways Perforant Alvear Fornix Efferent Pathways Fornix

  4. Amygdaloid Complex Afferent Pathways Cingulum StriaTerminalis Lateral oflactorystria Efferent Pathways StriaTerminalis Amygdalofugal

  5. Septal Nuclei & Nucleus Accumbens Septal Pathways MFB (A&E) Striaterminalis (A) Fornix (A&E) Striamedullaris (E) Nuc. Acc. Pathways MFB (A&E) Stria terminals (A) Fornix (A)

  6. Learning and Memory • Associative Learning • Formation of associations between 2 features in the environment • Nonassociative Learning • Experience produces changes in the magnitude of the response

  7. Cellular Mechanisms of Memory • Hebb’s Postulate: • Cells that fire together • wire together; Cells that • fire out of sync lose their • link • Long-Term Potentiation • Enhancement of synaptic efficacy following strong stimulation

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