*doesn't know who he/she is* =(

by Anonymous 11 years ago

Myelin is a substance that covers neurons.

by Anonymous 11 years ago

I'll elaborate a little in case anyone is interested :) Myelin is a protein that makes up the myelin sheath which covers and protects the axon part of the neuron. The sheath allows the impulses to get safely and quickly across. If there is a degradation of the myelin, it can cause disorders like multiple sclerosis.

by Anonymous 11 years ago

And now I feel retarded. I get it now xD

by Anonymous 11 years ago

I always thought myelin is mostly lipids and water... And I've always wondered, how does insulating neurons with myelin increase the speed of impulses if it makes them stop at intervals?

by Anonymous 11 years ago

Oh, right. It is mostly lipid with some protein. My memory of this is getting foggy. My guess is that even though the impulse stops at intervals, it is still all about the insulation. Myelin is a bad conductor, so the current can't escape and remains concentrated on the axon with nowhere to go but forward, especially since it is confined to a small area surrounded by the sheath.

by Anonymous 11 years ago

LOok up saltatory condition,I can't explain now but that's the term

by Anonymous 11 years ago

*conduction

by Anonymous 11 years ago

Way more clear and specified than my explanation. Thanks, anon.

by Anonymous 11 years ago