Gradenigo’s syndrome involves all of the following cranial nerves:
**Core Concept**
Gradenigo's syndrome is a rare but serious infection involving the petrous apex of the temporal bone. It is characterized by inflammation of the petrous apex, which leads to the involvement of adjacent cranial nerves.
**Why the Correct Answer is Right**
Gradenigo's syndrome typically involves the trigeminal nerve (cranial nerve V), specifically the fifth cranial nerve's abducens nerve (VI) is often affected as well due to the close proximity to the petrous apex. The syndrome is caused by the spread of infection from the petrous apex to these nerves, resulting in symptoms such as facial pain, abducens nerve palsy, and sometimes, sixth cranial nerve (abducens nerve) palsy. The involvement of these nerves is due to their anatomical proximity to the petrous apex.
**Why Each Wrong Option is Incorrect**
**Option A:** The facial nerve (cranial nerve VII) is not typically involved in Gradenigo's syndrome, making this option incorrect. The facial nerve is not in close proximity to the petrous apex.
**Option B:** The glossopharyngeal nerve (cranial nerve IX) is not a common nerve involved in Gradenigo's syndrome, making this option incorrect.
**Option C:** The vagus nerve (cranial nerve X) is not associated with Gradenigo's syndrome, making this option incorrect.
**Clinical Pearl / High-Yield Fact**
Gradenigo's syndrome is often associated with chronic otitis media, mastoiditis, or other petrous apex infections, highlighting the importance of monitoring for these complications in patients with these conditions.
**Correct Answer: C. V and VI.**