Cortical Structures of the Limbic System
description
Transcript of Cortical Structures of the Limbic System
Cortical Structures of the Limbic System
Most notable structures Primary functionOrbitofrontal gyri Very diverseCingulate gyrus EmotionIsthmus Emotion + MemoryParahippocampal gyrus Memory Uncus Olfaction
Subcortical Structures of the Limbic System
Most notable structures:Septal nucleiNucleus accumbensMammillary bodyAmygdalaDorsal thalamusHabenulaHippocampal formation
Most notable efferent pathways:FornixStria terminalisVentral amygdalofugalMammilothalamic
Hippocampal Formation
Afferent PathwaysPerforant
AlvearFornix
Efferent PathwaysFornix
Amygdaloid Complex
Afferent PathwaysCingulum
Stria TerminalisLateral oflactory stria
Efferent PathwaysStria TerminalisAmygdalofugal
Septal Nuclei & Nucleus Accumbens
Septal PathwaysMFB (A&E)
Stria terminalis (A)Fornix (A&E)
Stria medullaris (E)
Nuc. Acc. PathwaysMFB (A&E)
Stria terminals (A)Fornix (A)
Learning and Memory
Associative Learning Formation of associations between 2 features in the environment
Nonassociative LearningExperience produces changes in the magnitude of the response
Hebb’s Postulate:
Cells that fire togetherwire together; Cells thatfire out of sync lose theirlink
Cellular Mechanisms of Memory
Long-Term Potentiation Enhancement of synaptic efficacy following strong stimulation