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optic nerve |
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optic nerve: see vision vision, physiological sense of sight by which the form, color, size, movements, and distance of objects are perceived.
Vision in HumansThe human eye functions somewhat like a camera; that is, it receives and focuses light upon a photosensitive ..... Click the link for more information. . optic nerve [′äp·tik ‚nərv] (neuroscience) The second cranial nerve; a paired sensory nerve technically consisting of three layers of special nerve cells in the retina of the eye; fibers converge to form the optic tracts. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| In the Articulata we can commence a series with an optic nerve merely coated with pigment, and without any other mechanism; and from this low stage, numerous gradations of structure, branching off in two fundamentally different lines, can be shown to exist, until we reach a moderately high stage of perfection. Just as a photographic plate receives a different impression of a cluster of stars when a telescope is part of the intervening medium, so a brain receives a different impression when an eye and an optic nerve are part of the intervening medium. The light from it had beat upon his sealed lids, and the eyes and the optic nerves had pulsated to little, sparklike flashes, warm-coloured and strangely pleasing. |
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