Why is the olfactory nerve considered a part of the PNS? |
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| Posted: 10 January 2010 11:10 AM |
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Total Posts 14
Joined 2009-02-19
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Same goes for optic n. as well. Their locations do not seem congruent with the formal definition of the PNS vs. the CNS.
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| Posted: 11 January 2010 11:19 AM |
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Total Posts 38
Joined 2008-12-20
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I think both CN I and II are considered tracts of the CNS because they are myelinated by oligos rather than schwann cells. Somebody correct me if I’m wrong.
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| Posted: 11 January 2010 04:50 PM |
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Total Posts 179
Joined 2008-01-28
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Technically, the optic nerve (CN I) consists of very short neurons traversing the cribiform plate from the olfactory bulb to sense smell in the nose. The olfactory tract (terminating in the bulb) is a part of the CNS. The optic nerve is really a misnamed part of the CNS.
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| Posted: 11 January 2010 05:09 PM |
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Administrator
Total Posts 88
Joined 2007-02-18
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Not sure what it matters but all cranial nerves are PNS. CNS is just brain, brainstem, and spinal cord.
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| Posted: 11 January 2010 07:18 PM |
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Total Posts 34
Joined 2009-08-23
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Hey socrates, I agree that it doesn’t matter, but everything I’ve ever read considers the retina and optic nerve to be part of the CNS by virtue of their embryonic origins and my neuroanatomy class basically said the same thing as feculence.
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