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Optic nerve

The optic nerve is the nerve that transmits visual information from the retina to the brain.

The optic nerve is composed of retinal ganglion cell axons and support cells.

It leaves the orbit (eye) via the optic canal, running postero-medially towards the optic chiasm where there is a partial decussation (crossing) of fibers from the temporal visual fields of both eyes.

Most of the axons of the optic nerve terminate in the lateral geniculate nucleus from where information is relayed to the visual cortex.

The optic nerve contains 1.2 million nerve fibers.

This number is low compared to the roughly 130 million receptors in the retina, and implies that substantial pre-processing takes place in the retina before the signals are sent to the brain through the optic nerve.

Note:   The above text is excerpted from the Wikipedia article "Optic nerve", which has been released under the GNU Free Documentation License.
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August 31, 2015

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