lecture1 - Neuroanatomy from the neuron up TWO types of...

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1 Neuroanatomy from the neuron up • TWO types of central nervous system cells: • Glial Cells - Astrocytes, Oligodendrocytes, Schwann cells, Microglia •Neurons
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2 Basic structure of a nerve cell • Cell body – receives info from other neurons, contains nucleus and organelles • Dendrites (and dendritic spines) receive info from other neurons • Axon – conducts info to other neurons (myelinated vs. unmyelinated) •S
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3 Neurons Classified by Shape Neurons Classified by Size
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4 Neurons Classified by Function • 1) Motoneurons • 2) Sensory neurons •3 ) Interneurons Nerve Impulses (aka action potentials) • All living cells are electrically polarized (more neg. inside than out) • Neuron contains ANIONS and CATIONS dissolved in the intracellular fluid • Nerve impulses pass through cells as
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5 • Resting membrane potential – electric potential difference across the membrane (usually –50 to –80 millivolts) • Action potential created by movement of sodium (Na+) ions into the cell
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6 • Rate = directly proportional to diameter of axon • Saltatory conduction
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This note was uploaded on 03/01/2009 for the course PSC 121 taught by Professor Henry during the Spring '08 term at UC Davis.

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lecture1 - Neuroanatomy from the neuron up TWO types of...

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