<prompt> Freys syndrome develops secondary to abberant innervation of the skin over parotid by which cranial nerve -IXXXIXII  <response>: Ans. is a i.e., IX Freys Syndrome Freys syndrome also known as Baillargers syndrome, Dupuys syndrome, auriculotemporal syndrome, or Frey-Baillarger syndrome is a rare neurological disorder resulting from damage to or near the parotid glands responsible for making saliva, and from damage to the auriculotemporal nerve often from surgery. The postganglionic CN IX fibers are responsible for stimulation of parotid secretion The interruption of these nerve fibers may lead to gland atrophy. In some cases of parotidectomy these CN IX fibers are aberrantly reinnervated to the skin, causing gustatory sweating or Freys syndrome. 