INBDE (Integrated National Board Dental Examination) Practice Exam

Pharyngeal arch 1 gives rise to what Cranial Nerve (CN)?

1. CN V

2. CN VII

3. CN IX

4. CN X

The correct answer is: CN V

Pharyngeal arch 1, also known as the mandibular arch, gives rise to Cranial Nerve V, which is the trigeminal nerve. The trigeminal nerve is responsible for providing sensory innervation to the face, as well as motor functions for chewing muscles. This is why option A is the correct answer. Options B, C, and D are not correct because: - Cranial Nerve VII (option B) is the facial nerve, which is derived from the second pharyngeal arch. - Cranial Nerve IX (option C) is the glossopharyngeal nerve, originating from the third pharyngeal arch. - Cranial Nerve X (option D) is the vagus nerve, which is formed from the fourth and sixth pharyngeal arches.