Lecture 5 - 03:08 ThestuffoftheBrain

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03:08 The stuff of the Brain Nerve cells (neurons)- half of the mass of the brain Types of Neurons Sensory neurons- afferent, carry information to the brain Motor neurons- efferent, carry information away from the brain Interneuron’s- small, some cover short and some cover long distances, mostly short  distances, carry info between nerve cells Structure of the Neuron- think of your hand 3 main pieces: axon, dendrites, and the soma Axon- tail Dendrites- fingerlike projections, branches Soma- in the center, cell body Myelin sheath- glial cell that serves as insulation on the axon Speeds up communication Without it, signals form the brain to the body are slower Axon Hillock- where axon joins the soma Node of Ranvier- spaces between myelin Glial cells- hold nerve cells in place, provide nutrients, smaller than nerve cells, take  away waste products, support cells We can only prove causation when we manipulate the independent variable If there is a correlation then there is association Neuronal Communication- an electrochemical process Chemicals produce changes in the nerve cells electrical potential positive and negative ions can make the cell either + or - Electrical changes in the cell result in the release of chemicals which then impact the  electrical state of other nerve cells
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This note was uploaded on 02/18/2012 for the course PSYCH 202 taught by Professor Roberts during the Fall '06 term at University of Wisconsin.

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Lecture 5 - 03:08 ThestuffoftheBrain

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