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Re: [HAPS-L] Myelination

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Subject: Re: [HAPS-L] Myelination
From: Ken Saladin <ksaladin@xxxxxxxxxx>
Date: Sun, 18 Feb 2007 08:43:11 -0500
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Why are the postganglionic nerve fibers in the autonomic NS unmyelinated? Is this some type of evolutionary adaptation? Is this so that the signals don't get to the organs too quickly?

I appreciate your time and insights.

Regards,
Darren

Maybe to save space where speed of response is not crucial. Somewhere or other, I read that myelination or nonmyelination is a tradeoff between nerve fiber bulk and conduction speed. Why have large bulky fibers (and their metabolic maintenance costs) if it isn't necessary to get a response within mere milliseconds? But there may be other answers, and I look forward to hearing some.

Ken

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References:
- [HAPS-L] Myelination
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