Neural%20Signals%20Figs%20BW

Neural%20Signals%20Figs%20BW - Neural Signals A. Neurons...

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Unformatted text preview: Neural Signals A. Neurons & Reflex Circuits B. Membrane Potential C. Action Potential Structure of Vertebrate Neurons Cell Body Dendrites Myelinated Axon Synapse Postsynaptic Neuron Axon terminals The Stretch Reflex +- + Knee Extensor (Quadriceps) Knee Flexor (Hamstring) TAP Sensory neuron Extensor motor neuron Flexor motor neuron Inhibitory interneuron Signals in the Nervous System Signals are brief changes in the electrical potential difference across the plasma membrane of neurons. Postsynaptic potentials are graded, local signals 5 ms 20 mV Action potentials are all-or- none signals that propagate long distances regeneratively stimulus- 90 + 40 V m (mV) Ionic Basis of the Membrane Potential (V m ) 5 mM KCl 150 mM KCl Outside Inside Cl- K + +- Na+ K+ K + (chemical) (electrical) At equilibrium, the outward (concentration-driven) flux of K + is equal (and opposite) to the inward (electrically driven) flux of K + . EXTRACELLULAR (0 mV) INTRACELLULAR (-70 mV) Na + channel K + channel Cl...
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This note was uploaded on 10/12/2009 for the course BISC 220 taught by Professor Mcclure during the Spring '09 term at USC.

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Neural%20Signals%20Figs%20BW - Neural Signals A. Neurons...

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