Re: RE: [HAPS-L] Cauda Equina

[Sandy Neps <sandy.neps@xxxxxxx>]

Just curious.... what type of cell myelinate these fibers? 

Sandy 



Tallitsch, Robert wrote:


> Victor: As you know, the the CNS is made of the brain and spinal cord. 
The cauda equina is formed because, after age 4, the spinal cord stops 
growing but the vertebral column continues to grow. This vertebral 
growth carries with it the spinal nerves and the dorsal root ganglia 
farther from their original position relative to the adult spinal cord. 
As a result of this, the dorsal and ventral roots gradually elongate. 
The long ventral and dorsal roots that extend caudal to the conus 
medullaris form the cauda equina. (Human Anatomy, 5th ed., Martini, 
Timmons and Tallitsch).
>
>Now, the question is this: Is the CNS composed of the brain, spinal 
cord and the ventral roots and dorsal root ganglia of the spinal 
nerves, or just the brain and spinal cord. That the cauda equina is 
surrounded by the meninges does not mean it is part of the CNS. The 
blood vessels that supply the brain and spinal cord are (at least in 
part) covered by the meninges, but they are not part of the CNS--they 
are part of the cardiovascular system. 
>
>Spinal nerves, as well as the dorsal and ventral roots of the spinal 
nerves, are not typically considered to be part of the CNS, even though 
the proximal portions of the ventral and dorsal roots are covered by 
meninges. So, even through there is no clear cut definition in the 
sources I can find, my vote would be that the cauda equina is NOT part 
of the CNS
>
>Bob Tallitsch
>
>-----Original Message-----
>From: valvarez@xxxxxxxx [mailto:valvarez@xxxxxxxx]
>Sent: Wed 21-Mar-07 3:20 PM
>To: HAPS-L@xxxxxxxxxxx
>Subject: Re: [HAPS-L] Cauda Equina
> 
>Is the cauda equina part of the CNS or PNS?
>
>(It is still surrounded by the meninges...)
>
>Thanks in advance,
>Victor
>
>-- 
>Victor Alvarez, D.C., M.A.
>Delaware Technical and Community College
>Stanton Campus
>400 Stanton-Christiana Rd.
>Newark, DE 19713-2111
>(302) 454-3951
>
>
>************************************************************
>Robert B. Tallitsch, Ph.D.				
>Professor of Biology				
>Augustana College
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