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    so I am completely confused....

    how would the optic nerve fit in this for example:
    1) High light levels hit photoreceptors in retina
    2) Nerve impulses pass along sensory neurone to the CNS in the brain

    Now I know the optic nerve fits in there somewhere... but how!? Does it pass along the sensory neurone, leaving the eye via the optic nerve?

    I hope this makes sense as im even confusing myself ha!

    Any help would be greatly appreciated.
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    (Original post by ELB141)
    so I am completely confused....

    how would the optic nerve fit in this for example:
    1) High light levels hit photoreceptors in retina
    2) Nerve impulses pass along sensory neurone to the CNS in the brain

    Now I know the optic nerve fits in there somewhere... but how!? Does it pass along the sensory neurone, leaving the eye via the optic nerve?

    I hope this makes sense as im even confusing myself ha!

    Any help would be greatly appreciated.
    The stimulus applied to the photoreceptors in the retina stimulate action potentials which travels to the optic nerve, and this carries it to the CNS. Here's a basic picture to help you. The actual process is a lot more complicated than that though, I've missed them out because I don't know what details you need to know
    Name:  optic_nerve.jpg
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    1) Light hits the photo receptors in the back of your eye (different wavelengths, different cells)
    2) The axons of these cells leave the eyeball via the optic disc (note, as there are no cells at this point, you can't see anything in this area. This forms the basis of the 'blind spot'.)
    3) Once these axons leave the eyeball, the join to form the optic nerve, which is a sensory nerve that relays information from the eye to the visual cortex (and several other structures on the way).
    4) Profit???
 
 
 
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