RDA Head, Neck, and Oral Anatomy — Questions and Answers
Question 1: Which cranial nerve provides the primary sensory innervation to the teeth, gingivae, and most oral structures?
- Cranial Nerve V (Trigeminal) (Correct answer)
- Cranial Nerve VII (Facial)
- Cranial Nerve IX (Glossopharyngeal)
- Cranial Nerve XII (Hypoglossal)
Correct answer: Cranial Nerve V (Trigeminal)
The trigeminal nerve (CN V) is the main sensory nerve of the face and mouth. Its three branches—ophthalmic, maxillary, and mandibular—supply sensation to the teeth, periodontium, lips, and most of the oral mucosa. This is why local anesthetic blocks target trigeminal branches.
Question 2: The parotid, submandibular, and sublingual glands are collectively called:
- Minor salivary glands
- Major salivary glands (Correct answer)
- Mucous glands
- Serous glands
Correct answer: Major salivary glands
The parotid, submandibular, and sublingual glands are the three pairs of major salivary glands. They produce the bulk of saliva. Minor salivary glands are the hundreds of small glands scattered throughout the oral mucosa.
Question 3: The masseter, temporalis, medial pterygoid, and lateral pterygoid are known as the muscles of:
- Facial expression
- Deglutition
- Mastication (Correct answer)
- Tongue movement
Correct answer: Mastication
The four muscles of mastication—masseter, temporalis, medial pterygoid, and lateral pterygoid—are responsible for moving the mandible during chewing. They are all innervated by the mandibular branch (V3) of the trigeminal nerve.
Question 4: Which structure marks the boundary between the hard palate and soft palate?
- Incisive papilla
- Pterygomandibular raphe
- Vibrating line (Correct answer)
- Hamular notch
Correct answer: Vibrating line
The vibrating line is the imaginary line at the junction of the hard and soft palate, visible when the patient says 'ahh.' It is a critical landmark in complete denture construction and oral anatomy assessments.
Question 5: The Stensen's duct, which carries saliva from the parotid gland into the mouth, opens opposite which teeth?
- Mandibular central incisors
- Maxillary first and second premolars
- Maxillary first and second molars (Correct answer)
- Mandibular canines
Correct answer: Maxillary first and second molars
Stensen's duct (parotid duct) opens into the oral vestibule opposite the maxillary first and second molars on the buccal mucosa. The papilla is called the parotid papilla. Knowing this landmark is important when placing cotton rolls and during intraoral examination.
Question 6: Which bone forms the posterior portion of the hard palate?
- Maxilla
- Palatine bone (Correct answer)
- Vomer
- Sphenoid bone
Correct answer: Palatine bone
The hard palate is formed by two bones: the palatine processes of the maxilla (anterior two-thirds) and the horizontal plates of the paired palatine bones (posterior one-third). The vomer forms the nasal septum, not the palate.
RDA Head, Neck, and Oral Anatomy
Which cranial nerve provides the primary sensory innervation to the teeth, gingivae, and most oral structures?