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Kalman Rubinson kr4 at is2.nyu.edu
Fri Feb 12 11:38:37 EST 1999


Walter Eric Johnson (wej3715 at scully.tamu.edu) wrote:
> Kalman Rubinson (kr4 at is2.nyu.edu) wrote:
> : Walter Eric Johnson (wej3715 at scully.tamu.edu) wrote:
> : > Which reflexes involve the brain for the processing?  Even the corneal
> : > reflex, as near as the brain is, is entirely processed within the
> : > trigeminal nerve.
> : 
> : How do you figure that?  The afferent limb is the trigeminal nerve and the
> : efferent limb is the facial nerve.  Where is the connection if not in the 
> : brainstem?
> 
> I either misunderstood whatever gave me that idea or the source was
> wrong (probably the former).  In another source that I just looked in
> is the following: "Unilateral lesions of nerve V, the tegmentum of
> the pons, or the facial nerve alter this reflex."  So you are
> entirely correct.

BTW, there are many reflexes, all of which involve at least one synapse in the CNS. 
Local (peripheral) responses are not really reflexes.

Kal



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