NEURO EXAM III: AUDITORY SYSTEM CN 8
2025/2026 QUESTIONS WITH ANSWERS GRADED
A+
What portion of CN VIII is responsible for hearing? - Cochlear portion of the
vestibulocochlear nerve
What bone is the inner ear within? - Petrous portion of the temporal bone
External Ear Structures - Auricle
Ear Canal (E.A.M.)
Ends at tympanic membrane/ear drum
Middle Ear Structures - Stapes
Incus
Malleus
Ear drum/tympanic membrane
Eustachian tube
Inner Ear Structures - Cochlea
Vestibular apparatus (posterior to cochlea)
Vestibular nerve
Facial nerve
Semicircular canals
Which portion of the ear connects with the throat? - Eustachian tube
Allows for equalization of pressure and movement
Otitis Media - Inflammation of middle ear
common in children
, Otitis Externa - Inflammation of external ear
What runs through the internal auditory meatus? - Vestibular n
Facial n
Auditory n
What is the basic auditory pathway? - Eardrum --> middle ear --> oval window --> cochlear -
-> organ of corti
Round window - Part of cochlea, responsible for releasing energy
Which part of the cochlea has hair cells and causes depolarization/activation of NS? - Organ
of Corti
Function of Middle ear - Conduct sound vibrations
Protect inner ear via acoustic reflexes
Equalization of pressure
Which ossicle is attached to the oval window? - Stapes
Muscles of the inner ear - Stapedius muscle (Facial n, muffles sound waves, attaches to
stapes)
Tensor Tympani muscle (trigeminal n attaches to tympanic membrane to muffle sounds,
attaches to malleus)
Alignment of tensory tympani muscle - Sling alignment to malleus
What does the labyrinth of the inner ear contain? - Auditory part (cochlea)
Vestibular apparatus
Cochlea structure - Snail shell
2025/2026 QUESTIONS WITH ANSWERS GRADED
A+
What portion of CN VIII is responsible for hearing? - Cochlear portion of the
vestibulocochlear nerve
What bone is the inner ear within? - Petrous portion of the temporal bone
External Ear Structures - Auricle
Ear Canal (E.A.M.)
Ends at tympanic membrane/ear drum
Middle Ear Structures - Stapes
Incus
Malleus
Ear drum/tympanic membrane
Eustachian tube
Inner Ear Structures - Cochlea
Vestibular apparatus (posterior to cochlea)
Vestibular nerve
Facial nerve
Semicircular canals
Which portion of the ear connects with the throat? - Eustachian tube
Allows for equalization of pressure and movement
Otitis Media - Inflammation of middle ear
common in children
, Otitis Externa - Inflammation of external ear
What runs through the internal auditory meatus? - Vestibular n
Facial n
Auditory n
What is the basic auditory pathway? - Eardrum --> middle ear --> oval window --> cochlear -
-> organ of corti
Round window - Part of cochlea, responsible for releasing energy
Which part of the cochlea has hair cells and causes depolarization/activation of NS? - Organ
of Corti
Function of Middle ear - Conduct sound vibrations
Protect inner ear via acoustic reflexes
Equalization of pressure
Which ossicle is attached to the oval window? - Stapes
Muscles of the inner ear - Stapedius muscle (Facial n, muffles sound waves, attaches to
stapes)
Tensor Tympani muscle (trigeminal n attaches to tympanic membrane to muffle sounds,
attaches to malleus)
Alignment of tensory tympani muscle - Sling alignment to malleus
What does the labyrinth of the inner ear contain? - Auditory part (cochlea)
Vestibular apparatus
Cochlea structure - Snail shell
