Optic Nerve

The optic nerve (ON) is the second of twelve cranial nerves. The ON carries sensory nerve impulses conveying visual information from more than one million ganglion cells of the retina toward the visual centers in the brain. Embryologically it originates directly from the brain, which distinguishes the ON from all other nerves except the olfactory. It enters the orbit (qv) from the cranium through the optic canal (qv)

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