Advanced Vestibulocochlear Nerve Quiz

Q1. Which finding most strongly suggests a peripheral lesion affecting the cochlear component of CN VIII?

• Contralateral facial paralysis only
• Ipsilateral sensorineural hearing loss
• Ipsilateral tongue paralysis
• Loss of facial pain sensation

Q2. Why can a lesion in the internal acoustic meatus affect both hearing and facial movement?

• CN VIII supplies the muscles of facial expression
• Both nerves exit through the jugular foramen
• CN VII and CN VIII share the internal acoustic meatus
• CN VII carries all cochlear fibers

Q3. Which mechanism underlies the vestibulo-ocular reflex during a rapid head turn?

• Vestibular input drives compensatory eye movement opposite the head movement
• Facial motor fibers rotate the eyes
• Cochlear input contracts both pupils
• The optic nerve directly activates the semicircular ducts

Q4. Why can an acute unilateral vestibular lesion produce vertigo and spontaneous nystagmus?

• It paralyzes all extraocular muscles directly
• It blocks the optic chiasm
• It causes complete bilateral cochlear silence
• It creates an imbalance in tonic vestibular activity between the two sides

Q5. Which feature best distinguishes a cochlear lesion from a purely vestibular lesion?

• Primary hearing loss favors cochlear involvement
• Vertigo alone proves cochlear involvement
• Loss of taste identifies cochlear damage
• Facial weakness is specific for cochlear injury

Q6. Which sequence correctly traces the main ascending auditory pathway after cochlear nerve entry?

• Cochlear nuclei to corticospinal tract to cerebellum to frontal cortex
• Spiral ganglion to trigeminal ganglion to superior colliculus to motor cortex
• Cochlear nuclei to superior olivary pathways to lateral lemniscus to inferior colliculus to medial geniculate body to auditory cortex
• Vestibular nuclei to medial lemniscus to lateral geniculate body to visual cortex

Q7. Why is the superior olivary complex important for sound localization?

• It compares binaural timing and intensity information
• It produces endolymph in the cochlea
• It controls contraction of the lateral rectus
• It contains the primary auditory receptor hair cells

Q8. Which anatomical pathway helps vestibular signals coordinate head and eye movements?

• Cochlear nuclei directly innervate extraocular muscles
• The geniculate ganglion controls vestibular reflexes
• The spiral ganglion sends motor axons to neck muscles
• Vestibular nuclei connect with ocular motor nuclei and spinal pathways

Q9. Which combination most accurately localizes a lesion to the vestibulocochlear nerve near the cerebellopontine angle?

• Bilateral loss of facial sensation with preserved hearing
• Ipsilateral oculomotor palsy as the only finding
• Isolated contralateral tongue paralysis
• Ipsilateral auditory or vestibular dysfunction with possible facial nerve involvement

Q10. Which statement best integrates vestibulocochlear nerve anatomy?

• CN VIII supplies facial sensation through three divisions
• CN VIII provides parasympathetic innervation to the lacrimal and salivary glands
• CN VIII carries cochlear and vestibular sensory information from inner ear receptors through the internal acoustic meatus to brainstem and cerebellar pathways
• CN VIII is a mixed motor nerve that exits through the stylomastoid foramen