11.11.05 - Cells in the Nervous System? Nerve A collection...

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Unformatted text preview: Cells in the Nervous System? Nerve A collection of neurons Neuron A single nerve cell Anatomy of a Neuron Soma Cell Body Nucleus In center Dendrtites Axons (the long ones) Myelin Sheath Covers Axons Schwann Cells Make Myelin Sheath Nodes of Romvie between sheath cells Terminals Synapse How do axons work? Neural cells transmit action potentials (all or none) Very different than a copper wire in that the signal is not simply an in one end out the other mechanism. Squids have giant axon o Able to but electrodes in it to measure potential Always think: How will changing the concentration/charge of the extracellulat fluid going to affect the situation? The Sodium Potassium Pump Maintains the concentration gradient A review of Channels o Voltage-Gated Potassium Channel K+ [150] Na + [15] Anions- K+ K+ [5] Na+ [150] Na+- - - - - - - - + + + + + + (separation of charges) This generates an action potential (resting) of -70 mV How Action Potentials Work o...
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This note was uploaded on 02/11/2008 for the course BIO G 101 taught by Professor Gilbert,c. during the Fall '07 term at Cornell University (Engineering School).

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11.11.05 - Cells in the Nervous System? Nerve A collection...

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