HIS Ear Anatomy & Physiology 2

Question 1

Which structure connects the middle ear to the nasopharynx and helps equalize pressure?

Accepted Answer

Eustachian tube

Answer

The Eustachian tube (auditory tube) connects the middle ear cavity to the nasopharynx, allowing pressure equalization on both sides of the tympanic membrane.

Question 2

The oval window is a membrane-covered opening that connects which two structures?

Accepted Answer

Middle ear to inner ear

Answer

The oval window is a membrane-covered opening in the bony wall separating the middle ear from the inner ear, where the stapes footplate transmits vibrations.

Question 3

Which type of hair cells in the cochlea are primarily responsible for active amplification of sound?

Accepted Answer

Outer hair cells

Answer

Outer hair cells (OHCs) are electromotile and provide active mechanical amplification of basilar membrane motion, boosting sensitivity by up to 40–60 dB.

Question 4

What is the primary function of the round window in the cochlea?

Accepted Answer

To allow fluid pressure to dissipate after oval window displacement

Answer

The round window membrane flexes outward when the oval window is pushed inward, allowing incompressible cochlear fluid to move and basilar membrane displacement to occur.

Question 5

Reissner's membrane separates which two compartments of the cochlea?

Accepted Answer

Scala vestibuli from scala media

Answer

Reissner's membrane forms the upper wall of the scala media (cochlear duct), separating it from the perilymph-filled scala vestibuli above.

(HIS) Hearing Instrument Specialist Certification Practice Test

(HIS) Hearing Instrument Specialist Certification Practice Test

HIS Ear Anatomy & Physiology 2