With the third pick in the 2009 NBA Draft, the Oklahoma City Thunder select James Harden.
The nervous system is divided into the peripheral nervous system and the central nervous system. Fortunately, damaged peripheral nerves can regenerate after injury. However, the optic nerve and the spinal cord are in the central nervous system, and unfortunately cannot regenerate after injury.This is thought to be a result of inhibitory factors that are produced by cells that normally support the nerve fibers.n goldfish, the optic nerve can regenerate after injury. Molecular factors involved in structural support, gene regulation, and nerve fiber growth are produced in the goldfish optic nerve after injury.
If part of the optic nerve is damaged by glaucoma, the visual signals from a portion of the visual field are no longer reported to the brain and a blind-spot (called scotoma) is formed. Eye doctors may directly observe damage to the optic nerve damage by looking through the pupil with an ophthalmoscope. A healthy optic nerve is pink, and the ratio of the diameter of the optic cup to that of the optic disc in a healthy eye is generally less than 0.5 (see Chapter 1-B for more discussion).