Hearing Loss Ear Anatomy and Physiology 2

Question 1

Which structure separates the outer ear from the middle ear?

Accepted Answer

Tympanic membrane

Answer

The tympanic membrane (eardrum) divides the external auditory canal from the middle ear cavity.

Question 2

What is the primary function of the pinna (auricle)?

Accepted Answer

Collecting and funneling sound waves

Answer

The pinna gathers sound waves and directs them into the ear canal toward the eardrum.

Question 3

Which fluid fills the cochlear duct (scala media)?

Accepted Answer

Endolymph

Answer

Endolymph, high in potassium, fills the scala media and bathes the hair cells of the organ of Corti.

Question 4

The stapes transmits vibrations to the inner ear by pushing against which structure?

Accepted Answer

Oval window

Answer

The stapes footplate presses on the oval window, sending vibrations into the cochlear fluids.

Question 5

Which cells in the organ of Corti convert mechanical vibration into electrical signals?

Accepted Answer

Hair cells

Answer

Hair cells bend their stereocilia in response to vibration and trigger nerve impulses.

Hearing Loss Practice Test