Answers:
This is called the photic sneeze reflex. It's been said that if you feel a sneeze coming on and can't quite make it come, look at a bright light source and you will sneeze. Here's what a medical site has to say:
Mechanism of the Photic Sneeze
The mechanism of the bright light sneeze reflex seems to be an association of optic nerve fibers and trigeminal nerve nucleus in the mid-brain. The trigeminal nerve's second division supplies sensory fibers to the nasal mucosa. It is postulated that nerve impulses travelling up the optic nerve will cause a sympathetic discharge down the trigeminal nerve fibers. Another mechanism postulates that partial squinting of the eyes resulting from the bright light causes squeezing of the lacrimal sac which results in tears running down the nasolacrimal duct into the nasal cavity, causing stimulation of the nasal cavity and a sneeze.
I was told that it is the actually looking up that triggers the sinus to sneeze. I don't know...I sometimes sneeze when coming out of a building into bright light.
i've never ever heard of that
This article contents is post by this website user, EduQnA.com doesn't promise its accuracy.
More Questions & Answers...