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Myelin sheath

myelin sheath

(Science: anatomy, neurology) An insulating layer surrounding vertebrate peripheral neurons, that dramatically increases the speed of conduction. It is formed by specialised schwann cells, that can wrap around neurons up to 50 times. The exposed areas are called nodes of Ranvier: they contain very high densities of sodium channels and action potentials jump from one node to the next, without involving the intermediate axon, a process known as saltatory conduction. A layer of myelin encasing (and insulating) the axons of medullated nerve fibers.A layer of [[ phosphoplipids that surrounds nerve fibres.


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Myelin Sheath

No. The myelin sheath doesn't let disperse for electric impulses. And the more myelin (the larger diameter of neuron) the faster ...

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by MisterATP
Sat Aug 23, 2008 3:49 pm
 
Forum: Cell Biology
Topic: Myelin Sheath
Replies: 1
Views: 820

Myelin Sheath

... messages can travel along a neuron much quicker if we are warming up/exercising ... Does anyone know why this happens and how this is related to myelin sheaths? My only guess is that because the fatty layer of myelin becomes more fluid (due to temperature increase), and it will somehow increase ...

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by micco13
Sat Aug 23, 2008 7:51 am
 
Forum: Cell Biology
Topic: Myelin Sheath
Replies: 1
Views: 820

Re: The Physics of how the Myelin Sheath actually works.

I think it would actually look something more like this: http://forums.xkcd.com/download/file.php?id=2723 Series of 3 circuits (except I think the second circuit would be an open circuit, since there are no leak channels in the middle) I crossposted this from the xkcd forums, since n...

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by Nebulae
Thu Feb 28, 2008 3:47 am
 
Forum: Human Biology
Topic: The Physics of how the Myelin Sheath actually works.
Replies: 17
Views: 2981

Re: The Physics of how the Myelin Sheath actually works.

... on the other plate, the electrons begin to move in order to reach equilibrium. The movement of the electron charges is current flow. Now the sheath can be seen as the dielectric. The plates could be likened to the Ranvier nodes. I have a feeling some may not like me analogy, but I think it ...

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by MichaelXY
Thu Feb 28, 2008 3:14 am
 
Forum: Human Biology
Topic: The Physics of how the Myelin Sheath actually works.
Replies: 17
Views: 2981

Re: The Physics of how the Myelin Sheath actually works.

Hey, just goes to show that you can make sense and be completely wrong. In my defense, I'm an invert guy - we don't need no silly myelin!

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by Darby
Wed Feb 27, 2008 10:10 pm
 
Forum: Human Biology
Topic: The Physics of how the Myelin Sheath actually works.
Replies: 17
Views: 2981
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