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

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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
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