NEUR 310 Lecture Notes - Lecture 7: Squid Giant Axon, Phospholipid, Glycolipid
4 May 2015
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Document Summary
Electrical conduction how information gets from the dendrite to the very end of the axon. It is a negative membrane potential because more ions with positive charge outside of the membrane than inside the membrane. Sodium potassium and chloride when here is an input the membrane become more positive, massive inflexed of sodium membrane, depolarization of membrane potassium influx brings back to the normal potential Squid giant axon: largest known axon, very fast conduction: but, diameter of a pencil lead too much space. Insulate, and add in active booster stations. Saltatory conduction: action potential jumps from one booster station to the next. Saltatory conduction is 10 times faster than conduction in an unmyelinated axon of the same diameter. Invertebrates, which generally lack myelin, achieve high rates of impulse conduction simply by increasing the radius of their axons. In myelinated axons, voltage-gated na channels are limited to the nodal regions.
