Reason for crossed projections in the nervous system?

[Etha Schlemermeyer]

> 
>    Cajal thought it was to compensate for optical inversion of the images
>    projected onto the retinas.  See "Recollections of my Life" pp. 470-475.
> 
>                                      John A. Kiernan
>                                      Department of Anatomy
>                                      Univ. of Western Ontario
>                                      LONDON, Canada  N6A 5C1
>                                      e-mail: kiernan at uwo.ca
> 
But you need to compensate for Up-down, not for right-left. ??

Etha