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Spine Health | Last Active: Oct 19 10:14pm | Replies (25)
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@morkat This is probably a lot more than you would ever want to know about anatomy of the skull and eyes. The nerves that service the eyes originate from cranial nerves, and not spinal nerves in the neck. Here is a scientific explanation and if you scroll down, you'll find the section on the nerves to the eyes. The optic nerves actually cross under the base of the brain at the optic chiasm. My dad had a stroke that affected the optic chiasm, and he lost half of his field of vision in each eye. I think it was the right side in each eye that split in the middle.
https://www.kenhub.com/en/library/anatomy/blood-vessels-and-nerves-of-the-eye
If you look up a dermatome map, that will show you where each nerve that leaves the spine goes as it reached the skin surface.
I've also thought when you see an x-ray of plates on the spine, it looks a bit like a bicycle chain if you see it from the front.