Blood supply of facial nerve is/are
**Core Concept**
The blood supply of the facial nerve is crucial for its function and integrity. The facial nerve, also known as the seventh cranial nerve (CN VII), is responsible for controlling facial expressions, taste in the anterior two-thirds of the tongue, and conveying motor signals from the brain to the muscles of facial expression. The nerve has a complex blood supply that involves multiple arteries.
**Why the Correct Answer is Right**
The facial nerve receives its blood supply from the stylomastoid artery, a branch of the posterior auricular artery, which is itself a branch of the external carotid artery. This artery is responsible for supplying the nerve as it exits the stylomastoid foramen and traverses the parotid gland. Additionally, the anterior portion of the facial nerve receives blood supply from the anterior tympanic artery, a branch of the maxillary artery. The blood supply to the facial nerve is essential for maintaining its function and preventing damage during surgical procedures.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not correct because the blood supply of the facial nerve is not primarily from the occipital artery.
**Option B:** This option is incorrect because the middle meningeal artery is primarily responsible for supplying the dura mater and the calvaria, rather than the facial nerve.
**Option C:** This option is not correct because the lingual artery is responsible for supplying the tongue and the floor of the mouth, rather than the facial nerve.
**Clinical Pearl / High-Yield Fact**
It is essential to note that the facial nerve is at risk of injury during surgical procedures involving the parotid gland, such as parotidectomies. The nerve should be carefully identified and preserved during these procedures to prevent permanent damage.
**Correct Answer: D. Stylomastoid artery.**