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second cranial nerve
second cranial nerve The second cranial nerve, or optic nerve, transmits visual input from the retina into the brain.
The second cranial nerve, or optic nerve, transmits visual input from the retina into the brain. It is formed by fibers from retinal ganglion cells that partially cross at the optic chiasm and then project onward, and despite its name it is regarded as part of the central nervous system.