Ear: Anatomy and Histology

Question 1

Which of the following is the boundary of the middle ear?

A. Auricle to the Tympanic Membrane

B. Tympanic Membrane to round window

C. Oval Window to Internal Acoustic Meatus

D. Tympanic Membrane to oval window

Answer 1

Tympanic Membrane to oval window

Question 2

Look at this and know it: External Ear Histology

Answer 2

External Ear Histology

Question 3

Which of the following innervates the roof of the external aurditory canal?

A. Great Auricular (C3)

B. Vagus N.

C. Auriculotemporal

D. Facial N.

Answer 3

Facial N.

Question 4

What is the only place in the body where skin, periosteium, and bone all exist directly on top of each other?

A. Outer 2/3rds of External Acoustic Meatus

B. Inner 1/3 of External Acoustic Meatus

C. All of the External Acoustic Meatus

D. None of the above

Answer 4

Inner 1/3 of External Acoustic Meatus

Question 5

Answer 5

Cool

Question 6

The outside layer of the Tympanic membrane is lined with ___________, while the inside layer is lined with ______________.

A. Pseudostratified columnar; simple columnar

B. Stratified Squamous; Simple cuboidal

C. Stratified squamous; simple columnar

D. Simple columnar; simple cuboidal

Answer 6

Stratified Squamous; Simple cuboidal

Question 7

The Middle Ear is located in the Petrous portion of the Temporal B. (FF: The temporal bone is the only bone of the body that has another bone in it). Which of the following correctly specifies the medial wall of the middle ear/tympanic cavity where one would find the oval window?

A. Tegmental wall

B. Membranous wall

C. Mastoid Wall

D. Labyrinth wall

Answer 7

Labyrinth wall

• A. Tegmental wall: roof*
• B. Membranous wall: lateral*
• C. Mastoid Wall: posterior*
• Jugular wall: superior*
• Carotid Wall: Anterior*

Question 8

Look

Answer 8

See

Question 9

Look

Answer 9

See

Question 10

Which of the following is connected to the round window?

A. Scala Media

B. Stria Vascularis

C. Scala Vestibuli

D. Scala Tympani

Answer 10

Scala Tympani

Question 11

Which of the following is moved by the Stapes at the oval window? What other structure is it continuous with?

A. Scala Media

B. Stria Vascularis

C. Scala Vestibuli

D. Scala Tympani

Answer 11

Scala Vestibuli

Scala Tympani

Question 12

Get a Closer Look at the Organ of Corti

Answer 12

Saw it

Question 13

Which of the following functions to catch sound waves and concentrate them so the EAM transmits them to the tympanic membrane?

A. Internal Ear

B. Middle Ear

C. External Ear

Answer 13

External Ear

Question 14

Which of the following takes the sound waves and turns them into physical movement. This area also has the pressure equalized by the Pharyngotympanic tube.

A. Internal Ear

B. Middle Ear

C. External Ear

Answer 14

Middle Ear

Question 15

What general function is the inner ear responsible for?

Answer 15

Balance and Sound

Question 16

What is the path of the sound waves?

Use the following terms: stapes, oval window, vestibular membrane, scala media, basilar membrane, sterocilia, round window

Answer 16

1. The Stapes moves the oval window pushing the pressure wave into the perilymph in Scala Vestibuli
2. The pressure wave distorts the vestibular membrane moving the pressure into the scala media’s endolymph
3. The pressure wave in the endolymph displaces the basilar membrane, and that movement triggers the sterocilia of hair cells
4. This pressure now moves to the perilymph in the Scala Tympani and exits through the round window

Question 17

Innervated hair cells with stereocilia are attached to the _______, which are theampulla with gelatinus like cups

Answer 17

Innervated hair cells with stereocilia are attached to the Cupulla, which are theampulla with gelatinus like cups

Question 18

Otolithic membrane is covered with calcium carbonate/protein crystals called otoconia. These are found in the Macula to help determine postional information. What positional information does the utricle determine? The Saccule?

Answer 18

Utricle: Forward

Sacule: Up

Question 19

Which of the following spaces lies within the Organ of Corti?

A. Perilymphatic space

B. Endolymphatic Space

C. Corticolymphatic space

Answer 19

Corticolymphatic Space

Question 20

T/F: Mastoiditis is the infection of Mastoid cells that can spread into the cranial fossa via the petrosquamous cranial suture

Answer 20

True

Question 21

Meniere’s Syndrome and Viral Labyrnthitis present similarly. PTs experience vertigo, tinnitis, and is associated with increased endolymph volume which causes abnormal signalling. What is the main difference between the two that was stated in lecture?

Answer 21

Viral Labryinthitis usually resolves in about a week