Ear Anatomy

Which part of the External Auditory Canal (EAC) contains cerumen glands and hair cells?

• Inner 2/3rd

• Middle 1/3rd

• Outer 1/3rd

• The entire canal

What type of bone comprises the inner 2/3rd of the EAC?

• Parietal bone

• Temporal bone

• Occipital bone

• Sphenoid bone

What is the function of the Eustachian tube?

• It helps in hearing by transmitting sound waves.

• It connects the middle ear to the inner ear.

• It balances the pressure between the middle ear and the environment.

• It is responsible for the sense of balance.

Which nerve innervates the Eustachian Tube (ET), Middle Ear, and Mastoid area?

• CN VII (Facial nerve)

• CN IX (Glossopharyngeal nerve)

• CN VIII (Vestibulocochlear nerve)

• CN X (Vagus nerve)

Where does the stapes footplate sit within the middle ear?

• Within the round window

• Within the external auditory meatus

• Within the oval window

• Within the tympanic membrane

Which muscle is attached to the neck of the malleus?

• Stapedius

• Tensor tympani

• Levator palatini

• Tensor veli palatini

When does the Eustachian Tube briefly open?

• When a person sneezes

• When a person coughs

• When a person swallows or yawns

• When a person breathes deeply

What is the Aditus to Mastoid Antrum?

• A bone separating the middle ear from the mastoid antrum

• A collection of air-filled spaces in the mastoid antrum

• A mucus membrane lining the mastoid air cells

• An opening from the middle ear to mastoid antrum

What is the tegmen tympani?

• The opening from the middle ear to the mastoid antrum

• A mucus membrane lining the mastoid air cells

• A thin plate of bone separating the middle cranial fossa from the mastoid antrum

• A collection of air-filled spaces in the mastoid antrum

What is the lining of the mastoid air cells continuous with?

• The lining of the mastoid process

• The lining of the pharyngotympanic tube

• The lining of the middle ear

• The lining of the tegmen tympani