Advanced Lips Quiz

Q1. Why can lip lacerations bleed substantially?

• The vermilion is supplied directly by the internal carotid artery only
• The lips contain a large dural venous sinus
• The labial arteries form a rich anastomotic vascular network
• The lips contain no veins

Q2. Why is precise alignment of the vermilion border important when repairing a lip laceration?

• Small misalignment produces a conspicuous visible contour defect
• The border forms the bony maxillary arch
• The border is the site of the parotid duct opening
• The vermilion contains the only motor nerve to the lip

Q3. Which embryological fusion forms the lateral portions of the upper lip?

• Second pharyngeal arches
• Lateral nasal prominences alone
• Maxillary prominences
• Mandibular prominences

Q4. Which embryological structure contributes the philtrum of the upper lip?

• Intermaxillary segment from the fused medial nasal prominences
• Second pharyngeal pouch
• Lateral nasal prominences only
• Mandibular arch cartilage

Q5. What developmental error most directly underlies a typical unilateral cleft lip?

• Failure of the first and second pharyngeal pouches to fuse
• Failure of the palatine shelves to fuse only
• Failure of fusion between a maxillary prominence and medial nasal prominence
• Failure of the mandibular prominences to unite

Q6. Why can lower lip sensory loss follow injury near the mental foramen?

• The lingual nerve exits the skull there
• The glossopharyngeal nerve terminates there
• The mental nerve emerges there before supplying the lower lip
• The facial nerve enters the mandible there

Q7. Why can upper lip sensory loss occur after injury to the infraorbital nerve?

• It is the motor nerve of orbicularis oris
• It terminates exclusively in the hard palate
• The infraorbital nerve gives sensory branches to the upper lip
• The nerve supplies only the muscles of mastication

Q8. Why does weakness of orbicularis oris impair oral competence?

• It elevates the soft palate during swallowing
• It opens the auditory tube
• Orbicularis oris is essential for closing and shaping the oral aperture
• It retracts the mandible

Q9. Why can lymphatic drainage patterns of the lower lip matter in malignant spread?

• Different regions drain toward submental and submandibular nodal groups
• All lower lip lymph drains directly to axillary nodes
• The lower lip has no lymphatic vessels
• All lymph enters the cavernous sinus without passing through nodes

Q10. Which statement best integrates lip anatomy?

• They consist entirely of skin without muscle or glands
• They are mobile musculomucocutaneous folds with distinct epithelial zones, rich vascularity, facial motor supply and trigeminal sensation
• They are extensions of the nasal septum supplied only by the ophthalmic artery
• They are rigid bony plates supplied only by the hypoglossal nerve