**Question:** Which of the suprahyoid muscle is supplied by both facial nerve and mandibular nerve?

**Core Concept:** The suprahyoid muscles are a group of muscles in the neck that are involved in swallowing and maintaining the position of the hyoid bone. The facial nerve (CN VII) and the mandibular nerve (CN V3) are both important nerves in the head and neck region.

**Why the Correct Answer is Right:** The correct answer is **C.** The stylohyoid muscle is the suprahyoid muscle that is supplied by both the facial nerve (CN VII) and the mandibular nerve (CN V3). The stylohyoid muscle is responsible for elevating the styloid process, which helps in swallowing and maintaining the position of the hyoid bone in the neck.

**Why Each Wrong Option is Incorrect:**

A. The mylohyoid muscle is supplied by the lingual nerve (CN Lingual VII) and the mental nerve (CN V3), not the facial nerve.
B. The geniohyoid muscle is supplied by the facial nerve (CN VII) and the buccal nerve (CN V2), not the mandibular nerve.
D. The styloglossus muscle is supplied by the hypoglossal nerve (CN XII) and not the mandibular nerve.

**Why the Correct Answer is Right:** The correct answer, **C.** the stylohyoid muscle, is supplied by both the facial nerve (CN VII) and the mandibular nerve (CN V3). This dual supply ensures a thorough innervation for the stylohyoid muscle, which plays a crucial role in swallowing and maintaining the position of the hyoid bone in the neck.

**Why Each Wrong Option is Incorrect:**

A. The mylohyoid muscle is supplied by the lingual nerve (CN VII) and the mental nerve (CN V3), not the facial nerve. This makes option A incorrect because it does not mention the involvement of the mandibular nerve.
B. The geniohyoid muscle is supplied by the facial nerve (CN VII) and the buccal nerve (CN V2), not the mandibular nerve. This makes option B incorrect because it does not mention the involvement of the mandibular nerve.
D. The styloglossus muscle is supplied by the hypoglossal nerve (CN XII) and not the mandibular nerve. This makes option D incorrect as it does not mention the involvement of the mandibular nerve.

**Clinical Pearl:** A detailed understanding of the innervation of the suprahyoid muscles is essential for understanding the function of these muscles in maintaining proper swallowing and head positioning. In this case, recognizing that the stylohyoid muscle receives dual innervation from the facial nerve (CN VII) and the mandibular nerve (CN V3) is crucial for understanding the function of this muscle and its role in maintaining proper head positioning and swallowing.