A 36-year-old woman is admitted to the hospital with severe head injuries after a car crash. During neurologic examination it is noted that her uvula is deviated to the right. Which of the following muscles is paralyzed?
**Core Concept**
The question tests the student's understanding of the anatomy of the palate and its innervation. The levator veli palatini muscle plays a crucial role in elevating the soft palate during swallowing, and its paralysis can lead to uvular deviation.
**Why the Correct Answer is Right**
The correct answer is the left levator veli palatini muscle. The muscle is innervated by the pharyngeal plexus, which receives contributions from the vagus nerve (cranial nerve X) and the glossopharyngeal nerve (cranial nerve IX). The pharyngeal plexus supplies the motor branches to the muscles of the palate, including the levator veli palatini. In this case, the paralysis of the left levator veli palatini muscle leads to the deviation of the uvula to the right, as the intact right levator veli palatini muscle elevates the soft palate on that side.
**Why Each Wrong Option is Incorrect**
**Option B:** The tensor veli palatini muscle is also innervated by the mandibular division of the trigeminal nerve (cranial nerve V3) and plays a role in tensing the soft palate, but its paralysis would not lead to uvular deviation.
**Option C:** The right levator veli palatini muscle is intact, which is why the uvula is deviated to the right, not to the left.
**Option D:** The right tensor veli palatini muscle is also intact, and its paralysis would not lead to uvular deviation.
**Clinical Pearl / High-Yield Fact**
In cases of unilateral paralysis of the levator veli palatini muscle, the uvula deviates to the same side as the paralyzed muscle. This is because the intact contralateral muscle elevates the soft palate, leading to the characteristic deviation.
**✓ Correct Answer:** A. **Left levator veli palatini**