INBDE (Integrated National Board Dental Examination) Practice Exam

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What CN arises from pharyngeal arch 4?

The correct answer is: X

The cranial nerve that arises from pharyngeal arch 4 is the vagus nerve, which is also known as CN X. This is because each pharyngeal arch is associated with a specific cranial nerve. Option A, the spinal accessory nerve (CN XI), arises from pharyngeal arch 3. Option C, the glossopharyngeal nerve (CN IX), arises from pharyngeal arch 3 and 4. Option D, the facial nerve (CN VII), arises from pharyngeal arch 2. Therefore, the other options are incorrect as they do not correspond with the pharyngeal arch in question.