Editing Mydriasis (section)

===Autonomic neuropathy===
[[Parasympathetic]] fibers travel with [[cranial nerve]] III, the [[oculomotor nerve]], to innervate the circular layer of muscle of the eye (sphincter pupillae). Damage to this nerve typically manifests itself as mydriasis, because the [[sympathetic nervous system|sympathetic]] supply to the pupil, which causes mydriasis, remains unaffected, and therefore unopposed.

Multiple [[central nervous system]] disorders e.g. [[epilepsy]], [[stroke]], and impending [[brain herniation]] are known to lead to temporal mydriasis as well. A brain catastrophe, or a rapidly increasing brain mass, can cause compression of the oculomotor nerve.