Question 1

The membranous labyrinth is the only portion of the inner ear that contains endolymph.

Accepted Answer

This is true. The membranous labyrinth is the portion of the inner ear that contains endolymph, a fluid that is important for hearing and balance. The bony labyrinth surrounds the membranous labyrinth and helps protect it.

Question 2

Which of the following structures of the ear function(s) as (an) organ(s) in the sense of equilibrium?&#10;A) Vestibule and semicircular ducts&#10;B) Cochlea&#10;C) Eustachian tube&#10;D) Pinna&#10;E) Bony labyrinth

Accepted Answer

The vestibule and semicircular ducts are part of the inner ear and are responsible for the sense of equilibrium, specifically for detecting head position and movement. The cochlea is responsible for hearing. The Eustachian tube helps regulate air pressure within the ear and the pinna is the external part of the ear that helps with sound localization, but neither are involved in the sense of equilibrium. The bony labyrinth is a term used to describe the entire complex of the inner ear, which includes both the vestibule and semicircular ducts (involved in equilibrium) and the cochlea (involved in hearing).

Question 3

Which membrane separates the cochlear duct from the scala tympani, and provides a surface on which the spiral organ rests?&#10;A) Vestibular membrane&#10;B) Tectorial membrane&#10;C) Cochlear membrane&#10;D) Basilar membrane&#10;E) Tympanic membrane

Accepted Answer

The basilar membrane separates the cochlear duct (also known as scala media) from the scala tympani. It is also where the spiral organ (or organ of Corti) rests, making it the primary membrane involved in sound perception in the inner ear. The vestibular membrane separates the cochlear duct from the scala vestibuli, while the tectorial membrane is an extracellular matrix that overlies the spiral organ. The cochlear membrane and tympanic membrane are not involved in separating the cochlear duct and scala tympani.

Question 4

The inner ear contains the organs for both hearing and equilibrium.

Accepted Answer

The inner ear contains both the cochlea, responsible for hearing, and the vestibular system, responsible for balance and equilibrium.

Question 5

The S-shaped tube of the ear is called the&#10;A) auditory tube.&#10;B) membranous labyrinth.&#10;C) external acoustic meatus.&#10;D) bony labyrinth.&#10;E) tympanic cavity.

Accepted Answer

The external acoustic meatus is the tube-like portion of the ear that extends from the auricle to the eardrum. It is S-shaped in humans and helps to protect the delicate structures of the middle and inner ear. The auditory tube connects the middle ear to the throat, the membranous labyrinth is a structure within the inner ear, the bony labyrinth refers to the bony structures of the inner ear, and the tympanic cavity is another name for the middle ear.

Question 6

Which of the following is NOT true of sound wave frequency?&#10;A) Different sound wave frequencies are perceived as different degrees of loudness.&#10;B) The units for sound wave frequency are hertz (Hz).&#10;C) Different sound wave frequencies stimulate specific hair cells in certain portions of the spiral organ.&#10;D) Sound wave frequency can be reported in waves per second.&#10;E) All of these are true of sound wave frequency.

Accepted Answer

Different sound wave frequencies are perceived as different pitches, not different degrees of loudness. Loudness is perceived by the amplitude or intensity of the sound wave.

Question 7

In the Rinne test, when the sound of the tuning fork can no longer be heard through bone conduction, normal hearing is indicated if the sound can once again be heard through air conduction.

Accepted Answer

This is the correct statement about the Rinne test.

Question 8

Which of the following is NOT true of the Weber test?&#10;A) This test can distinguish conduction or sensory deafness.&#10;B) The test is performed by placing a vibrating tuning fork against the midline of the forehead.&#10;C) If a person has conductive hearing impairment, the sound will be heard louder in the normal ear.&#10;D) In the case of normal hearing, a person will hear the sound with equal loudness in both ears.&#10;E) All of these are true of the Weber test.

Accepted Answer

The Weber test, when indicating conductive hearing loss, will result in the sound being heard louder in the affected ear, not the normal ear. This is because conductive hearing loss can enhance the perception of sound conducted through bone in the affected ear, making the sound seem louder on that side.

Question 9

Which of the following structures is NOT part of the external ear?&#10;A) Auricle&#10;B) Pinna&#10;C) External acoustic meatus&#10;D) Tympanic cavity&#10;E) All of these structures are parts of the external ear.

Accepted Answer

The Tympanic cavity is part of the middle ear, not the external ear.

Question 10

Which of the following membranes acts as a rigid roof over the cilia of the hair cells of the spiral organ, causing the cilia to bend against it when sound waves are present?&#10;A) Basilar membrane&#10;B) Tympanic membrane&#10;C) Cochlear membrane&#10;D) Vestibular membrane&#10;E) Tectorial membrane

Accepted Answer

The tectorial membrane acts as a rigid roof over the cilia of the hair cells of the spiral organ, causing the cilia to bend against it when sound waves are present.

Question 11

The tympanic cavity is a fluid-filled chamber in the middle ear.

Accepted Answer

The answer of The tympanic cavity is a fluid-filled chamber...

Question 12

Which of the following structures is NOT part of the bony labyrinth?&#10;A) Cochlea&#10;B) Tympanic membrane&#10;C) Vestibule&#10;D) Semicircular canals&#10;E) All of these structures are part of the bony labyrinth.

Accepted Answer

The answer of Which of the following structures is NOT...

Question 13

Which of the following is NOT a chamber found in the cochlea?&#10;A) Scala tympani&#10;B) Vestibule&#10;C) Cochlear duct&#10;D) Scala vestibuli&#10;E) All of these are chambers found in the cochlea.

Accepted Answer

The answer of Which of the following is NOT a...

Question 14

What is the function of the pharyngotympanic tube?&#10;A) To transmit sound waves to the tympanic membrane&#10;B) To drain endolymph into the pharynx&#10;C) To equalize the pressure on both sides of the eardrum&#10;D) To drain perilymph into the pharynx&#10;E) To transmit sound waves to the spiral organ

Accepted Answer

The answer of What is the function of the pharyngotympanic...

Question 15

Which chamber of the inner ear receives sound waves directly from the oval window?&#10;A) Cochlear duct&#10;B) Scala media&#10;C) Scala tympani&#10;D) Vestibule&#10;E) Scala vestibuli

Accepted Answer

The answer of Which chamber of the inner ear receives...

Deck 38: Ear and Hearing