Chapter 6 Part 2

Question 1

What are the 2 windows of the middle ear?

Answer 1

Round window, oval window

Question 2

Membrane supporting the base of the stapes

Answer 2

Oval window

Question 3

Thin, tough and elastic membrane in the middle ear

Answer 3

Round window

Question 4

Point of greatest retraction

Answer 4

Umbo

Question 5

What quadrant will the cone of light be observed?

Answer 5

Anterior inferior quadrant

Question 6

Embedded in the middle layer of the tympanic membrane

Answer 6

Manubrium

Question 7

Occupies the space in the oval window

Answer 7

Footplate

Question 8

What happens to pressure as area decreases?

Answer 8

Increases

Question 9

What is the threshold for area advantage (dB)?

Answer 9

23.6

Question 10

What is the threshold for lever action advantage (dB)?

Answer 10

2.3

Question 11

The malleus lever arm is approximately ___% longer than the incus lever arm,

Answer 11

30

Question 12

Due to the lever action advantage, how much force will be amplified?

Answer 12

1.3

Question 13

The advantage is increased when the fulcrum is moved ____ to the mass to be lifted.

Answer 13

Closer

Question 14

What are the functions of the middle ear muscles (stapedius muscle and tensor tympani muscle)

Answer 14

Protect the hearing system

Question 15

How does the stapedius muscle protect the hearing system?

Answer 15

pulls stapes laterally and posteriorly, making the movement of the ossicular chain less efficient