cortical-spinal conections

[Sandra L Wegert]

On 3 Nov 1995, Stephen Lessnick wrote:

> I have recently been asked to find info on the following, but have not 
> been particularly successful.  Does anyone have information regarding:
> 
> 1)  Why (from a teleological {sp?} point of view) does the right 
> hemisphere control (and receive information predominantly from) the left 
> side of the body and visa-versa?  I'm sure there have been a number of 
> theories advanced.  If you have references for the theories it would be 
> really helpful.
> 
> 2)  When in evolution does this pattern of crossed connections arise?
> 
> Thanks!

The answer is developmental.  The way the brain has to fold 
during embryonic development results in the crossed architecture.  I 
don't know the answer to # 2, sorry.

Sandra

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sandraw at U.Arizona.EDU