After removal of the Parotid gland, patient is having sweating on cheeks while eating. In this complication seen after parotidectomy, the auriculotemporal nerve which contains parasympathetic secretomotor fibres to parotid gland is fused with which nerve?
**Core Concept**
The auriculotemporal nerve carries parasympathetic secretomotor fibers from the glossopharyngeal nerve (cranial nerve IX) to the parotid gland. After parotidectomy, if the nerve is damaged, it can lead to aberrant regeneration and inappropriate connections with other nerves, causing complications like Frey's syndrome.
**Why the Correct Answer is Right**
Frey's syndrome, also known as gustatory sweating, occurs when the auriculotemporal nerve forms an aberrant connection with the sympathetic fibers of the facial nerve (cranial nerve VII). This connection leads to the release of acetylcholine, causing sweating and flushing in the area of the parotid gland bed, particularly in response to stimuli like eating or thinking about food. The facial nerve's sympathetic fibers, which normally regulate sweating and vasodilation, become misdirected to the parasympathetic secretomotor fibers of the auriculotemporal nerve.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the sympathetic fibers of the cervical sympathetic chain are not directly involved in Frey's syndrome. While they do play a role in regulating sweating and vasodilation, they are not the primary nerves involved in this condition.
**Option B:** This option is incorrect because the vagus nerve (cranial nerve X) is not directly involved in Frey's syndrome. While it does carry parasympathetic secretomotor fibers to various glands, the auriculotemporal nerve's aberrant connection is specifically with the facial nerve.
**Option C:** This option is incorrect because the trigeminal nerve (cranial nerve V) is not directly involved in Frey's syndrome. While it does provide sensory innervation to the face, the auriculotemporal nerve's aberrant connection is specifically with the facial nerve.
**Clinical Pearl / High-Yield Fact**
To remember the nerves involved in Frey's syndrome, think of the "Frey's triangle": the auriculotemporal nerve (cranial nerve IX), the facial nerve (cranial nerve VII), and the sympathetic fibers of the cervical sympathetic chain. This triangle highlights the aberrant connection that leads to gustatory sweating.
**Correct Answer: C. Trigeminal nerve is incorrect, the auriculotemporal nerve is fused with the facial nerve.**