Exam 1 CH 3 Study Guide

Question 1

What is found within the bony walls of the cochlea?

Answer 1

Labyrinth

Question 2

A complex network of delicate membranes found within the inner ear.

Answer 2

Membranous Labyrinth

Question 3

At what point does the middle ear become the inner ear?

Answer 3

Stapes footplate

Question 4

What does the stapes footplate fill up?

Answer 4

Round window

Question 5

What is the space called that is behind the oval window?

Answer 5

Vestibule

Question 6

What 3 parts of the ear does the vestibule lead to?

Answer 6

1. Hearing part of ear
2. Cochlea
3. Vestibular part

Question 7

How many sections is the cochlea separated into?

Answer 7

3

Question 8

All sections of the cochlea are curved are what?

Answer 8

Modiolus

Question 9

What begins the cochlea?

Answer 9

Base

Question 10

What ends the cochlea?

Answer 10

apex

Question 11

What are the three portions of the cochlea referred to as?

Answer 11

scala

Question 12

How many membranes are in cochlea? How many portions (scala) are in the cochlea?

Answer 12

membranes = 2

portions (scala) = 3

Question 13

List the membranes of the cochlea (2).

Answer 13

1. Reissner’s membrane

2. Basilar membrane

Question 14

The reissner’s membrane separates the scala vestibuli from what other structure?

Answer 14

Scala media

Question 15

Draw the diagram of the membranes and scala of the cochlea.

Answer 15

See notes.

Question 16

Fluid in scala vestibuli is called

Answer 16

perilymph

Question 17

Fluid in scala media is called

Answer 17

endolymph

Question 18

The basilar membrane separates what two scala?

Answer 18

Scala media and tympnai

Question 19

Fluid in the scala tympani is called

Answer 19

perilymph

Question 20

What is a helicotrema?

Answer 20

A small opening at the apical end of the cochlea that forms the connection between the scala tympani and vestibuli.

Question 21

What does the helicotrema form a connection between?

Answer 21

1. Scala tympani

2. Scala vestibuli

Question 22

Where is the basilar membrane considerably narrower at?

Answer 22

At the base rather than the apical end

Question 23

When does sound energy reach the inner ear?

Answer 23

When the stapes footplate (at the end of ossicular chain) moves in and out.

Question 24

Describe how sound travels in the cochlea.

Answer 24

See printed sheet.

Question 25

What are traveling waves?

Answer 25

Motions of the basilar membrane in response to sound.

Question 26

How do traveling waves progress through the cochlea?

Answer 26

Begin at the base; move toward the apex

Question 27

What does the amplitude (size) of the traveling wave depend on?

Answer 27

The intensity of the stimulus.

Question 28

What does the region of max size of the traveling wave depend on?

Answer 28

The frequency of the stimulus.

Question 29

Where is the Organ of Corti specifically located?

Answer 29

Basilar Membrane

Question 30

Organ of Corti AKA

Answer 30

Organ of hearing

Question 31

What is the superior border of the Organ of Corti called?

Answer 31

Tectorial membrane

Question 32

What fluid is found in the Organ of Corti?

Answer 32

Cortilymph

Question 33

What is there more of - inner or outer hair cells?

Answer 33

Outer hair cells

Question 34

What contributes to the tonotopic organization of the cochlea?

Answer 34

Mechanical properties

Question 35

Responsiveness to higher frequency sounds occurs toward the what of the basilar membrane?

Answer 35

TIght and stiff basal end of the basilar membrane

Question 36

How are lower frequencies represented in terms of the basilar membrane?

Answer 36

Loose/less stiff apical end

Question 37

What is most hearing loss due to?

Answer 37

Dysfunction of hair cells within the inner ear

Question 38

What does damage to hair cells caused by diseases or by exposure to very high intensity sounds usually result in?

Answer 38

Irreversible, permanent hearing loss