Outer Ear

Question 1

Name four parts of the temporal bone

Answer 1

Squamous
Petrous
Mastoid
Tympanic

Question 2

Name the parts of the outer ear

Answer 2

Pinna
External Auditory Canal
Tympanic Membrane

Question 3

The resonance of the pinna is ____ Hz

Answer 3

5000

Question 4

What two interaural mechanisms are used for sound localization

Answer 4

Interaural time delays
Interaural intensity differences

Question 5

Length of the adult ear canal

Answer 5

2.5 to 3 cm length
.75 cm diameter

Question 6

The auricle lies at what angle?

Answer 6

15 to 30 degrees

Question 7

The outer ear functions as a ____, ____, and a ____.

Answer 7

Protector
Collector
Locator

Question 8

Name two differences between the pediatric and adult external auditory canals

Answer 8

Length - the adult canal is longer
Shape - the adult canal is more s-shaped while the pediatric canal is more flat

Question 9

The _____ portion of the external auditory canal sits laterally and makes up ___/3 of the EAC.

Answer 9

Cartilaginous
1

Question 10

The _____ portion of the external auditory canal sits medially and makes up ___/3 of the EAC.

Answer 10

Bony
2

Question 11

The external auditory canal is covered by epidermal lining.

Answer 11

True

Question 12

The cartilaginous component of the external auditory canal is medial to the bony portion.

Answer 12

False

Question 13

The primary function of the external auditory canal is to act as a(n) ____.

Answer 13

Acoustic resonator

Question 14

The external auditory canal is a quarter wave resonator.

Answer 14

True

Question 15

The external auditory canal provides ____ to ____ dB of gain at _____ to _____ Hz

Answer 15

10 to 15
3000 to 4000

Question 16

Interaural ______ affect higher frequencies at or above _____

Answer 16

Intensity differences
1500

Question 17

Interaural ______ affect lower frequencies at or below _____ Hz

Answer 17

Time differences/delays
800

Question 18

The head shadow effect is…

Answer 18

The effect of head diameter on the transmission of sound

Question 19

What is the purpose of cerumen?

Answer 19

Protection against infection and foreign bodies

Question 20

The lateral layer of the tympanic membrane is composed of the…

Answer 20

Epidermal lining of the ear canal

Question 21

The medial layer of the tympanic membrane is composed of the…

Answer 21

Mucosal membrane of the middle ear

Question 22

The tympanic membrane lies at what angle?

Answer 22

55 degrees

Question 23

The most concave place of the tympanic membrane is the…

Answer 23

Umbo

Question 24

The outer ear best amplifies frequencies ranging from _____ to ____ Hz, which are important for ________.

Answer 24

2000, 5000
understanding speech

Question 25

Collapsed ear canals occur when the ______ and is most prevalent amongst _____ and _____.

Answer 25

Cartilaginous portion of the EAC weakens and breaks down over time, becoming less effective at upholding the structure Geriatric populations Pediatric populations

Question 26

Microtia is....

Answer 26

A pathology where the auricle is underdeveloped/partially missing

Question 27

Aural Atresia is....

Answer 27

The absence of a patent ear canal, which may be either acquired or congenital

Question 28

Anotia is....

Answer 28

A pathology where the auricle is undeveloped/completely missing

Question 29

A disorder of the outer ear, if it were to cause a hearing loss, would cause a _____ hearing loss.

Answer 29

Conductive

Question 30

Label the auricle

Answer 30

Question 31

Label the hearing system

Answer 31