106L02_Notes - CBNS 106 Fall 06 Neuroscience 106 Lecture 2...

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CBNS 106 – Fall 06 106L02_Notes.doc Page 1 of 4 Neuroscience 106: Lecture 2: Neurons and Glia ASSIGNMENT: In Bear et al read chapter 1 and study chapter 2. I. Two Major Components of the Brain A. Neurons 1. Neurons function to receive, integrate and transmit information. 2. There are ~ a hundred billion neurons in the human brain. 3. Neurons receive an average of ~ 5,000 synaptic contacts. B. Glia 1. The term glia means glue. 2. There are three types of glia. a. Astrocytes provide supporting function for neurons. They do such things as buffer ion concentrations and provide metabolic fuel and also affect information processing by neurons. b. Oligodendrocytes and Schwann cells wrap around the axon to provide insulation. Oligodendrocytes are found in the central nervous system (CNS) and Schwann cells are found in the peripheral nervous system (PNS). c. Microglia (also known as phagocytes) clean up cellular derbies produced by damage 3. There are ~ ten times more glia than neurons.
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