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Flashcards in External And Middle Ear Deck (66)
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1

What does the ear consist of?

-external ear
-middle ear (tympanic cavity)
-internal ear, or labyrinth, which contains the organs of hearing and balance

2

What does the external ear consist of?

The auricle or pinna, and the external auditory meatus

3

Auricle

-Has a characteristic shape that allows it to collect air vibrations
-consists of a thin plate of elastic cartilage covered by skin

4

What kind of muscles does the auricle have?

Both intrinsic and extrinsic muscles that are innervated by the facial nerve

5

External auditory meatus

-curved tube that leads from the auricle to the tympanic membrane and conducts sound waves to the tympanic membrane

6

Outer third of the meatus

Composed of cartilage

7

Inner two thirds of external auditory meatus

Bone

8

Sensory nerve supplying the lining of the meatus

-auriculotemporal nerve
-auricular branche of the vagus nerve (CN X) ***

9

Lymph drainage of the external auditory meatus

Superficial parotid, mastoid, and superficial cervical lymph nodes ***

10

What is at the end of the external auditory meatus

Tympanic membrane

11

Tympanic membrane examination

-external auditory meatus must be pulled upward and backward for adults
-tympanic membrane is pearly gray and concave

12

What is the depression in the center of the tympanic membrane called

Umbo

13

What is the middle ear

An air filled cavity in the petrous portion of the temporal bone ***

14

What is the middle ear lined with and what does it contain

Mucous membranes and auditory ossicles

15

Middle ear communicates with what

In front of the nasopharynx via the auditory tube and behind with the mastoid antrum ***

16

Roof of middle ear (tympanic cavity)

Tegman tympani, a thin plate of bone, which is part of the petrous temporal bone; separates the tympanic cavity from the temporal lobe nd its meninges

17

Floor of the middle ear (tympanic cavity)

Thin plate of bone that separates the tympanic cavity from the superior bulb of the internal jugular veins

18

Anterior wall of the middle ear (tympanic cavity)

Thin plate of bone with two openings, one for the auditory tube and one of the tube of the tensor tympani

19

Posterior wall of middle ear (tympanic cavity)

Bone with an opening called the aditus to the mastoid antrum, and a small, conical projection called the pyramid

20

Medial wall of the middle ear (tympanic cavity)

Lateral wall of the inner ear, which has a rounded projection called the promontory, caused by the underlying cochlea; above and behind the promontory is the fenestra vestibuli (oval window); below and behind the promontory is the fenestra cochleae (round window)

21

Lateral wall of the middle ear

Formed by the tympanic membrane, which is obliquely placed, it is concave laterally

22

What are the auditory ossicles

Malleus, incus, stapes

23

What is the largest ossicle

Malleus

24

Process of malleus

Called the handle
Attached to the medial surface of the tympanic membrane

25

What does the malleus articulate with?

Incus

26

What does the incus articulate with?

Stapes

27

Where does the footplate or base of the stapes fit into?

Fenestra vestibuli (oval window)

28

What are the two muscles associated with the ossicles

The tensor tympani and the stapedius

29

Where does the tensor tympani originate

In the wall of the auditory tube and its own canal ***

30

Where does the tensor tympani insert?

Handle of the malleus