The diagnosis is made clinically based on the rash affecting only one dermatome associated with the ophthalmic division of cranial nerve V (trigeminal nerve).

The researchers then used another fluorescent molecule to tag all stem cells that were undergoing division in the process of staying "fresh" in case they were recruited to become mature nerve cells.

Superior division of oculomotor nerve coursed between optic nerve and superior rectus muscle after it left zinn ring, its branches entered into the superior rectus muscle and levator muscle.