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Optic nerve

optic nerve

(Science: anatomy, nerve) The optic nerve. The nerve carrying impulses for the sense of sight.

projection from the vertebrate retina to the midbrain. Embryologically, a cNS tract rather than a peripheral nerve. Popular experimental preparation for studies of regeneration of retino tectal projections in lower vertebrates and also for studies of glial cell lineage in CNS.

Synonym: cranial nerve II.


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What are some reasons that prove adaptations are not designe

... the light sensitive cells (rods and cones) are found behind the nerve cells - i.e., light has to pass through the nerve cells before striking the rods and cones. Also, those nerves have to leave the eye via the optic nerve, which passes through the retina, leaving a blind spot in each ...

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by thoffnagle
Thu Jan 31, 2013 1:04 am
 
Forum: Evolution
Topic: What are some reasons that prove adaptations are not designe
Replies: 12
Views: 6616

Re:

Almost everything your brain does in the optic area is process the almost-raw images. Yes, obviously. Your brain starts with a bunch of signals on your optic nerve (which have only been minimally processed), but ends up with highly processed information. ...

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by TheSunshineEmperor
Thu May 24, 2012 6:46 pm
 
Forum: Evolution
Topic: Evolutionary advantage of seeing 'upright'
Replies: 17
Views: 9322

Re: Evolutionary advantage of seeing 'upright'

... a television. It directly processes the signals coming in from your optic nerve - at no point does it try to reconstruct what your retina is seeing. If you're interested ...

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by TheSunshineEmperor
Wed May 23, 2012 5:03 am
 
Forum: Evolution
Topic: Evolutionary advantage of seeing 'upright'
Replies: 17
Views: 9322

Re: Evolutionary advantage of seeing 'upright'

... - does their brain rewire to invert the already-inverted image from the optic nerve, or does that part of their brain that tells them how to move rewire itself?

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by Rap
Tue May 22, 2012 3:00 pm
 
Forum: Evolution
Topic: Evolutionary advantage of seeing 'upright'
Replies: 17
Views: 9322

Re: UNILATERAL red-green color blindness

... associated with retinal pathology or compressive lesions involving the optic nerve/optic tract/occipital lobe of the brain. If the unilateral colour vision defect was detected ...

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by Curio
Wed Mar 03, 2010 2:37 pm
 
Forum: Genetics
Topic: UNILATERAL red-green color blindness
Replies: 7
Views: 12824
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