IUBio

Cross - Wired Eyes

Richard L. Hall rhall at webmail.uvi.edu
Wed May 16 14:49:12 EST 2001


Why would you assume that the decussation of projections from retinal 
ganglion cells in the pyramidal tract have different origins than 
those of the optic tract?  Don't they have a common origin in the 
retina?

rlh

>
>
>[Hammond]
>This is a very powerful line of analysis.  The situation
>certainly is complex.  For instance, there are two major
>decussations in optical-motor response.  One in the decussation
>of the optic tract, and the other in the decussation of the
>pyramidal tracts.  I would suppose they have different origins.
>the optic decussation is probably to nullify the lens inversion,
>but the (more massive) pyramidal decussation may be something along
>the lines you describe.  Also, the fornix has a suspicious
>congruence with the optic chiasma which would have to be analyzed.
>
>>
>>  Filip van den Bergh
>>
>>  Badly drawn figures (best viewed in courier font)
>>  S = sensory unit
>>  M = motor unit
>>  | = straight connection
>>  X = crossed connection
>>
>>  Figure A
>>
>>  S1   S2
>>  |     |
>>  M1   M2
>>
>>  Figure B
>>
>>  S1   S2
>>     X
>>  M1   M2
>
>--
>BE SURE TO VISIT MY WEBSITE, BELOW:
>-----------------------------------------------------------
>George Hammond, M.S. Physics
>Email:    ghammond at mediaone.net
>Website:  http://people.ne.mediaone.net/ghammond/index.html
>-----------------------------------------------------------

-- 
Richard L. Hall, Ph.D.
Comparative Animal Physiologist

University of the Virgin Islands
2 John Brewers Bay
St. Thomas, U.S.V.I. 00802

340-693-1386
340-693-1385 FAX

rhall at uvi.edu

"Live life on the edge...the view is always better"  rlh

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