APSY1030 Lecture Notes - Lecture 2: Cell Migration, Prenatal Development, Myelin
14 Mar 2016
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Current view some may develop postnatal but possibly have shorter lives. Cells move from original sites to form multiple layers of cortex: how does the cell know where to go, cells move in terms of different areas of brain. By 20 weeks cortical plate consists of 3 layers. By 28 weeks, 6 cortical layers: chemical reason why a cell goes into one place versus another, environmental reason, especially toxins, affect where a cell goes. Disorders can occur in cell migration: schizophrenia, fas/arnd, don"t see symptoms of schizophrenia until late teens, twenties. Basic support structures for neurons in cerebral cortex: glial cells. Bring nutrition, take away waste from other cells, allow more connections: myelination. Myelination continues rapidly in first year and for years after birth. Myelin increases right before a child learns to walk: dendrites. Allows for more connections to other cells, aiding in child development and brain growth. Early stimulation very important for children to encourage connections and dendrite growth.
