The Trigeminal nerve supplies sensory innervation to the cornea.  The Trigeminal nerves are accompanied by parasympathetic and sympathetic nerves from the pterygopalatine or sphenopalatine ganglion.  This is a discussion of a newly found connection. This is an interesting abstract I recently found that helps explain why SPG Blocks are effective for eye pain: Am J Rhinol Allergy. 2011 Jan-Feb;25(1):50-3. doi: … Continue reading Why Sphenopalatine Ganglion Blocks are Effective for Eye Pain.