All of the following are Digastric muscles, except?
**Core Concept**
The digastric muscles are a pair of muscles in the head and neck region that have two distinct bellies (gastric means "stomach-like" in Greek) connected by an intermediate tendon. They are involved in the movement of the hyoid bone and the mandible.
**Why the Correct Answer is Right**
The correct answer is the muscle that does not fit the description of having two distinct bellies connected by an intermediate tendon. The digastric muscles are unique in their anatomy and function, and identifying the correct muscle requires an understanding of human anatomy.
**Why Each Wrong Option is Incorrect**
**Option A:** The correct answer is not option A, as the digastric muscle is indeed a digastric muscle.
**Option B:** The correct answer is not option B, as the digastric muscle is indeed a digastric muscle.
**Option C:** The correct answer is not option C, as the digastric muscle is indeed a digastric muscle.
**Option D:** The correct answer is option D, as the masseter muscle is a single belly muscle that does not fit the description of a digastric muscle.
**Clinical Pearl / High-Yield Fact**
The digastric muscles are innervated by the mylohyoid nerve, which is a branch of the mandibular division of the trigeminal nerve. This is an important clinical correlation to remember when examining patients with facial or cranial nerve dysfunction.
**Correct Answer: D. Masseter muscle.**