1 Development of the Cortico-Limbic System: Paul Broca

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1 Development of the Cortico-Limbic System: Paul Broca

Paul Broca Development of the Cortico-Limbic System: • How Does the Brain Produce Emotion? • How Does Emotion Mature Postnatally in the Brain? by Francine Benes, Harvard Medical School Limbic Lobe in Mammalian Brain The Limbic System in Human Brain 1 The Corticolimbic System: Amygdalo-Cingulate Connections Integrating Emotion with Cognition Anterior Cingulate Affect + Attention Amygdala Emotional Hippocampus Learning Stress Memory +Learning How does the limbic lobe develop? Somites and the Human Embryo Autonomic Nervous System 4 weeks Parasympathetic N.S. → Digestive System, Bladder Sympathetic N.S. → Cardiovascular System 8 weeks 2 The Peripheral Autonomics: Sympathetics + Parasympathetics The Prenatal Human Brain Gyrus Sulcus Developmental of Gyral Patterns in Utero: Developmental of Gyral Patterns in Utero: 12-27 Weeks 28-44 Weeks 3 Cell Migration into Developing Cortical Plate HUMAN CORTEX 7 Months Prenatal Postnatal 4 Morphology of Synapses Synapse Formation During Development Summary Postnatal Development of Cerebral Cortex Development and Maturation of Neurons and Processes Mitosis Migration Axons Dendrites Synapses 1st +++ ++ + - - Trimester 2nd - +++ ++ + - Trimester 3rd - + +++ +++ ++ Trimester Postnatal - - + ++ +++ Period 5 Synaptic Pruning in Human Cortex During Postnatal Period Brain Weights Postnatal Increases of Myelin Myelin Formation In Human Brain Paul Yakolev: Does myelination continue into adulthood? Hippocampal Formation 6 Perforant Pathway and Distal Cingulum Bundle The Corticolimbic System: Amygdalar Projections to Rat Anterior Integrating Emotion with Cognition Cingulate Cortex at Various Postnatal Ages Anterior Cingulate Myelination Affect + Attention ? Amygdala Emotional Hippocampus Learning Stress Memory +Learning 7 Postnatal Increase of Amygdalar Inputs Formation of Synapses by Amygdalar Fibers to Anterior Cingulate Cortex in ACCx During Postnatal Period Amygdalar Fibers Form Appositions With Postnatal Increases of Amygdala-GABA GABA Cell Somata + Dendrites In Rat ACCx Interactions in Cingulate Cortex 8 The Corticolimbic System: Integrating Emotion with Cognition Summary and Conclusions 1. Human brain contains regions that are a. phylogenetically old and contribute to emotion b. phylogenetically new and contribution to cognition Anterior Cingulate Myelination Affect + Attention 2. Phylogenetically old and new parts are interconnected with one another and allow emotions and thoughts to be integrated with Fiber InGrowth? one another 3. Pre- and postnatal development of human brain parallels evolutionary development 4. Postnatal development of human brain continues into adolescence Amygdala Emotional Hippocampus and adulthood Learning Stress Memory +Learning 5. The plasticity of the brain throughout the life cycle provides a unique opportunity to continue maturing and learning 6. For those who have susceptibility genes for mental illness, maturational changes at critical stages of development may “trigger” the onset of illness Video Chapter Complete • You have completed this video chapter • Use the bookmarks to review any portion of the chapter • Click on the download link to download a handout of the slides 9.

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