Which of the following muscles are innervated by facial nerve?
**Core Concept**
The **facial nerve** (cranial nerve VII) is responsible for controlling the muscles of facial expression. It originates from the **brainstem** and has a complex course through the temporal bone before innervating its target muscles.
**Why the Correct Answer is Right**
The correct answer involves muscles that are directly innervated by the **facial nerve**, which includes all the muscles of facial expression such as the **zygomaticus major**, **orbicularis oculi**, and **buccinator**. These muscles are crucial for expressing emotions, closing the eyes, and aiding in the process of chewing and speech.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not specifically relate to the muscles of facial expression.
**Option B:** Incorrect as it is not a muscle primarily innervated by the facial nerve for the purpose of this question.
**Option C:** Incorrect because, although it might be related to facial functions, it is not the primary muscle group innervated by the facial nerve.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the **facial nerve** controls all the muscles of facial expression, which is crucial for diagnosing facial nerve palsy, where patients may exhibit weakness or paralysis of these muscles.
**Correct Answer:** D. Muscles of Facial Expression.