The second cranial nerve is not a true peripheral nerve but a tract of the diencephalon.
From the en.wikipedia.org
Each no bigger than a grain of sand, the SCN lie at the base of the brain, near to the optic tract, a nerve that runs directly to the retina.
From the newscientist.com
Light signals for this purpose travel through the retinohypothalamic tract and are not affected by optic nerve damage beyond where the retinohypothalamic tract exits.
From the en.wikipedia.org
There is a direct correspondence from an angular position in the field of view of the eye, all the way through the optic tract to a nerve position in V1.
From the en.wikipedia.org
This can result in fermentation and decomposition, producing undesirable byproducts, one of which is alcohol that can destroy or inhibit nerve function in the digestive tract.
From the heraldtribune.com
Left a partial paraplegic, he suffered years of painful urinary tract infections that set off excruciating nerve pain in his legs.
From the boston.com
Others believe it's due to an overly sensitive tract and an imbalance of the nerve-stimulating messenger chemical serotonin.
From the stltoday.com
The long nerve fibers of the cortico-spinal tract that reach from the brain to the spinal cord to directly control movement did not regenerate in NgR mice after spinal cord injury.
From the sciencedaily.com
Fifth, the optic nerve consists of a long, continuous tract of axons that are uninterrupted by interneurons, which makes it ideally suited for regeneration studies.