BIPN 140 9.30.10 Lecture 3 - BIPN1409.30.10Lecture3...

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BIPN 140 9.30.10 Lecture 3 Thursday Recap 2nd lecture Passive spread of current inside the axon describe the properties: Equivalent Circuit  Resisotor and Capacitor in Parallel Figure 3.1 in notes R__m, C_m Fig 3.12 on slides myelin in vertebrates many of our axons our myelinated how does myelin do its job? function of myelin there are very few channels underneath the myelin 1) myelin adds layers of membrane to the axon or around the axon 2) Resistance adds in series so that is good so the resistance to leak for current is greater: so harder for current to leak out 3)capacitance adds in parallel so the capacitance of the axon is reduced so less current is needed to charge the myelinated like capcaitors 4)myelin makes lambda larger the fast part of conductio in under the inner node the slower part of the conduction is at the nodes of Ranvier long inner nodes would be faster current 4)speeds conduction by myelin making lambda longer Figure 3.13 on slides Figured 3.14 on slides myelinated and unmyelinated axons saltatory conduction "jumping" conduction because the action potential jumps from node to  node I. Ion Channels
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1. 4 classes of channels
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