Frey’s syndrome is due to involvement of:
**Core Concept**
Frey's syndrome, also known as gustatory sweating or auriculotemporal syndrome, is a rare neurological disorder that occurs due to damage to the parotid gland or its surrounding nerves. This damage leads to aberrant regeneration of nerve fibers, resulting in an inappropriate connection between the sympathetic and parasympathetic nervous systems.
**Why the Correct Answer is Right**
The correct answer is related to the involvement of the auriculotemporal nerve, which is a branch of the mandibular division of the trigeminal nerve (V3). The auriculotemporal nerve carries sympathetic fibers from the superior cervical ganglion to the parotid gland, as well as parasympathetic fibers from the otic ganglion to the parotid gland. Damage to this nerve can lead to aberrant regeneration, resulting in the inappropriate release of acetylcholine, which stimulates both sweat glands and salivary glands, causing the symptoms of Frey's syndrome.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the vagus nerve is not directly involved in the pathophysiology of Frey's syndrome.
**Option B:** This option is incorrect because the facial nerve is not directly involved in the pathophysiology of Frey's syndrome, although it does provide motor innervation to the muscles of facial expression.
**Option C:** This option is incorrect because the glossopharyngeal nerve is not directly involved in the pathophysiology of Frey's syndrome, although it does provide sensory innervation to the tongue and pharynx.
**Clinical Pearl / High-Yield Fact**
Frey's syndrome is often seen as a complication of parotid surgery, such as parotidectomy, and can be triggered by the sight, smell, or taste of food, leading to excessive sweating and salivation.
**Correct Answer: C. Auriculotemporal nerve.