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Optic nerve - Wikipedia, the free encyclopedia (921 words) |
 | The optic nerve is the second of twelve paired cranial nerves but is considered to be part of the central nervous system as it is derived from an outpouching of the diencephalon during embryonic development. |
| Similarly, the optic nerve is ensheathed in all three meningeal layers (dura, arachnoid, and pia mater) rather than the epineurium, perineurium, and endoneurium found in peripheral nerves. |
| The optic nerve component lengths are 1 mm in the globe, 25 mm in the orbit, 9 mm in the optic canal and 16 mm in the cranial space before joining the optic chiasm. |
| IX. Neurology. 5b. The Optic Nerve. Gray, Henry. 1918. Anatomy of the Human Body. (893 words) |
| A few fibers of the optic nerve, of small caliber, pass from the primary centers to the retina and are supposed to govern chemical changes in the retina and also the movements of some of its elements (pigment cells and cones). |
| The optic nerve is peculiar in that its fibers and ganglion cells are probably third in the series of neurons from the receptors to the brain. |
| The crossed fibers of the optic nerve tend to occupy the medial side of the nerve and the uncrossed fibers the lateral side. |
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