optic nerve

noun Anatomy.
either one of the second pair of cranial nerves, consisting of sensory fibers that conduct impulses from the retina to the brain.

Origin:
1605–15

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Collins
World English Dictionary
optic nerve
 
n
the second cranial nerve, which provides a sensory pathway from the retina to the brain

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

optic nerve n.
A nerve that originates from the retina, passes out of the eye socket to the chiasm, where part of its fibers cross to the opposite side and pass to the geniculate bodies and anterior quadrigeminal body. Also called second cranial nerve.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
optic nerve  
Either of the second pair of cranial nerves, which carry sensory information relating to vision from the retina of the eye to the brain. Disease or injury of the optic nerve can result in partial or total blindness.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

optic nerve definition


The nerve that carries electrical signals from the retina in the eye to the brain.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

optic nerve

second cranial nerve, which carries sensory nerve impulses from the more than one million ganglion cells of the retina toward the visual centres in the brain. The vast majority of optic nerve fibres convey information regarding central vision

Learn more about optic nerve with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
In patients with glaucoma, fluid builds up within the eye and puts pressure on
  the optic nerve.
The device stimulates the retina's remaining healthy cells, causing them to
  relay the data to the optic nerve.
The anatomy of the optic nerve suggests that covering one eye does not cause
  input to only one brain hemisphere.
The electrodes stimulate the neurons in the retina, which send secondary
  signals down the optic nerve to the brain.
Image for optic nerve
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