Advanced Oral Cavity Quiz

Q1. Why can infection from the floor of the mouth spread into the submandibular region?

• The mylohyoid contains a large central foramen
• The sublingual and submandibular spaces communicate around the posterior border of mylohyoid
• The hard palate connects directly to the submandibular space
• The oral cavity opens directly into the carotid sheath

Q2. Why does the level of a mandibular tooth root relative to the mylohyoid line influence the spread of odontogenic infection?

• The mylohyoid line separates arterial from venous blood
• The mylohyoid attachment separates potential routes into sublingual and submandibular spaces
• The line marks the boundary of the nasal cavity
• All mandibular infections drain directly into the parotid gland

Q3. Why is the lingual nerve vulnerable during procedures in the posterior mandibular oral cavity?

• It lies inside the parotid duct
• It passes close to the lingual mandibular surface near the third molar region
• It travels through the pulp cavity of every molar
• It passes through the hard palate

Q4. Why can a rapidly expanding floor-of-mouth infection threaten the airway?

• The hard palate collapses into the larynx
• The mandible rotates into the trachea
• Swelling can elevate and posteriorly displace the tongue
• The infection directly closes the carotid arteries

Q5. Why is the parotid duct vulnerable in deep injuries of the cheek?

• It descends inside the carotid sheath
• It traverses the cheek and pierces buccinator before opening into the vestibule
• It passes through the carotid canal
• It lies entirely within the cranial cavity

Q6. Why is the rich vascular supply of the oral mucosa clinically significant?

• Oral mucosa has no arterial supply
• The mucosa is supplied only by cerebrospinal fluid
• All oral vessels are end arteries without anastomoses
• Rich vascularity promotes healing but can also cause significant bleeding

Q7. How does the mylohyoid help define anatomical spaces relevant to oral infection?

• It forms a muscular partition between sublingual and submandibular spaces
• It forms the posterior wall of the pharynx
• It divides the parotid gland into lobes
• It separates the oral cavity from the nasal cavity

Q8. Why can sensory loss of the lingual nerve affect more than touch sensation in the anterior tongue if chorda tympani fibers are also involved?

• The glossopharyngeal nerve joins the lingual nerve at the tongue tip
• Chorda tympani fibers travel with the lingual nerve in the floor of the mouth
• The hypoglossal nerve travels inside the lingual nerve
• The lingual nerve itself supplies all tongue muscles

Q9. Why are oral cavity lymphatic pathways clinically important in malignancy?

• The oral cavity has no lymphatic vessels
• Oral lymph drains only to axillary nodes
• Oral lymphatics drain to regional cervical nodes and may cross the midline
• All oral lymph drains directly into the thoracic duct without nodes

Q10. Which statement best integrates the anatomy of the oral cavity?

• It is part of the nasal cavity and contains no salivary duct openings
• It consists only of the tongue and hard palate
• It is a single bony chamber isolated from the pharynx
• It is a mucosa-lined compartment divided into vestibule and cavity proper with integrated dental, muscular, glandular, neurovascular, and pharyngeal relationships