Advanced Mandibular Nerve Quiz

Q1. What jaw movement is expected with a unilateral lesion of the motor component of V3?

• The jaw deviates toward the side of the lesion
• The jaw deviates away from the lesion
• The jaw cannot move vertically but never deviates
• The jaw deviates toward the intact side during closure only

Q2. Why can an inferior alveolar nerve block anesthetize the mandibular teeth on one side?

• The inferior alveolar nerve carries sensory fibers from the mandibular teeth through the mandibular canal
• It carries taste from all teeth
• It is the motor nerve to the tongue
• It supplies the maxillary teeth through the infraorbital canal

Q3. Which deficit would most strongly suggest injury to the lingual nerve proximal to its junction with chorda tympani?

• Paralysis of the muscles of mastication only
• Loss of sensation from the lower teeth with preserved tongue sensation
• Loss of posterior tongue taste only
• Loss of general sensation and taste from the anterior tongue with reduced submandibular and sublingual secretion

Q4. Why is the lingual nerve vulnerable during removal of a mandibular third molar?

• It passes through the maxillary sinus
• It travels inside the parotid duct
• It lies within the optic canal
• It courses close to the medial mandibular third molar region

Q5. Which finding would best indicate an isolated lesion of the inferior alveolar nerve distal to the origin of the nerve to mylohyoid?

• Loss of mandibular dental, lower lip, and chin sensation with preserved mylohyoid function
• Paralysis of orbicularis oculi
• Loss of all facial sensation with complete masticatory paralysis
• Loss of anterior tongue general sensation only

Q6. Why does a lesion of the auriculotemporal nerve potentially affect parotid secretomotor fibers even though those parasympathetic fibers originate from CN IX?

• Postganglionic CN IX fibers use the auriculotemporal nerve as a route to the parotid
• The auriculotemporal nerve contains preganglionic neurons from the trigeminal motor nucleus
• CN IX becomes V3 at the foramen ovale
• The parotid gland receives no autonomic innervation

Q7. Which combination best characterizes the anterior division of V3?

• Purely sensory branches with no motor supply
• Mainly motor branches with the buccal nerve as a sensory exception
• Mainly taste fibers with one motor exception
• Only parasympathetic branches to salivary glands

Q8. Which combination best characterizes the posterior division of V3?

• Mainly sensory branches with motor fibers continuing into the nerve to mylohyoid
• Purely motor branches to all muscles of mastication
• Purely sensory branches with no motor component anywhere
• Only autonomic fibers to the parotid gland

Q9. Which sequence correctly traces the motor pathway of V3 to a muscle of mastication?

• Nucleus ambiguus to V1 to ciliary ganglion to masseter
• Facial motor nucleus to lingual nerve to temporalis
• Trigeminal ganglion to V2 to facial nerve to a muscle of mastication
• Motor trigeminal nucleus to motor root to V3 to a mandibular motor branch to a muscle of mastication

Q10. Which statement best integrates mandibular nerve anatomy?

• V3 is purely sensory and enters the orbit through the superior orbital fissure
• V3 is purely parasympathetic and supplies only the parotid gland
• V3 is a branch of the facial nerve that exits the stylomastoid foramen
• V3 is a mixed trigeminal division passing through the foramen ovale with sensory, first arch motor, and hitchhiking autonomic relationships