PSY BEH 11A Lecture Notes - Lecture 9: Ontogeny, Neuroglia, Grey Matter
17 Oct 2016
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Neuroscience and behavior: at start of ontogenesis, neurons and glial cells are undifferentiated stem cells. Proliferation: during ontogenesis, new nerve cells proliferate at rates of 250,000 cells per minute. Pruning: axons are guided to the appropriate target by attractor proteins and. Repelling enzymes: 20%-80% of neurons in cortex die after neurogenesis, a process referred to as pruning, connections that work are retained, 100,000 connections are formed or destroyed every minute. Histological stain of the cortical surface interneurons are found in a 3 mm layer of grey matter on the surface of the cortex there are 6 distinct layers. Photomaps: neurons in the cortex are arranged in functional units known as columns. Neurons: basic building blocks of nervous system transmit messages throughout the brain and between the brain and rest of body, motor neurons (efferents, sensory neurons (afferents) interneurons (99%) Structure of neuron: dendrites receive information.
