Lesson 1 - The Outer Ear

Question 1

The isthmus is:

a. another name for the aperture
b. located at the second bend of the canal
c. where the canal narrows to enter the temporal bone
d. the area between the first and second bend

Answer 1

c. where the canal narrows to enter the temporal bone

Question 2

The adult ear canal:

a. is usually straight
b. curves like a vertical figure “S”
c. rises upward and forward, then descends to the drum
d. descends downward, then backward toward the drum

Answer 2

c. rises upward and forward, then decends to the drum

Question 3

The pinna and the external canal together:

a. Gather and reinforce acoustical signals
b. With the irregular shape of the auricle, cause increases and decreases at different frequencies as the sound arrives at the ear
c. forms a resonating tube
d. all of the above

Answer 3

d. all of the above

Question 4

The average resonant frequency of the ear canal plus concha is:

a. 1500 Hz
b. 2700 Hz
c. 3500 Hz
d. 1000 Hz

Answer 4

b. 2700 Hz

Question 5

The dividing line between the external ear and the middle ear is the:

a. malleus
b. Eustachian tube
c. oval window
d. tympanic membrane

Answer 5

d. tympanic membrane

Question 6

The ear canal contains:

a. cilia, ceruminous glands, sevaceous glands
b. ceruminous glands, pinna, scaffoid fossa
c. umbo, isthmus, sebaceous glands
d. crus, aperture, sebaceous glands

Answer 6

a. cilia, ceruminous glands, sevaceous glands

Question 7

The Vagus Nerve (Xth Cranial) is found:

a. along the bottom of the tympanic membrane
b. along the bottom of the ear canal
c. along the bottom of the intertragal notch
d. at the bottom of the isthmus

Answer 7

b. along the bottom of the ear canal

Question 8

Which of the following terms is not part of the tympanic membrane?

a. Pars tensa
b. crus
c. Pars flaccida
d. Umbo

Answer 8

b. crus

Question 9

An otoscopic inspection should reveal:

a. an external auditory canal sloping upwards and backwards
b. no vision of any ossicles
c. a clear view of the Vagus Nerve (Xth Cranial)
d. a view of the pearly white tympanic membrane

Answer 9

d. a view of the pearly white tympanic membrane

Question 10

Which of the following is a part of the pinna?

a. tragus
b. intertragal notch
c. triangular fossa
d. all of the above

Answer 10

d. all of the above