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Yr2 Control - Term 2 and 3 > Auditory Pathway > Flashcards

Flashcards in Auditory Pathway Deck (90)
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1

Which bone is the external acoustic meatus located within?

Petrous part of the temporal bone.

2

Where is the petrous part of the temporal bone?

In between the sphenoid and occipital bones.

3

Which nerve passes through the external acoustic meatus?

Facial (VII) nerve.

4

Which nerve terminates in the external acoustic meatus?

Vestibulocochlear (VIII) nerve.

5

What does the external ear consist of?

Air.
-sound waves pass through

6

How does sounds travel through the middle ear?

Sound waves travel through air >> mechanical energy (e.g. ossicles).

7

How does sound travel through the inner ear?

Mechanical energy >> electrical energy (nerves).

8

What is the process of sound passing into the ear?

Sounds waves
>> tympanic membrane
>> mechanical energy (ossicles)
>> movement of fluid (cochlear)
>> movement of hair cells
>> electrical energy (nerves)

9

How long is the external acoustic meatus?

2-3 cm.

10

What is another name for the auditory tube?

Eustachian tube.

11

What is the function of the auditory tube?

Enable air to pass from nasopharynx to middle ear.
-maintains equilibrium either side of tympanic membrane (e.g. opens when you swallow)

12

What does the external ear consist of?

Auricle & external acoustic meatus.
-ends at tympanic membrane

13

Where is the middle ear?

Air-filled cavity between tympanic membrane and the cochlea.

14

What structure opens into the middle ear?

Auditory tube.

15

Which part of the ear contains the ossicles?

The middle ear.

16

Which 3 bones makes up the ossicles?

-Malleus
-Incus
-Stapes

17

Why is the middle ear a high risk space for infections? (3)

-Connected to nasopharynx
-Traversed by chorda tympani and facial canal
-Connected to mastoid air cells (may spread to mid cranial fossa)

18

Why is there a risk of thrombosis in the middle ear?

Internal jugular vein lies inferior.

19

Why is there a link to pulsatile tinnitus in the middle ear?

Internal carotid artery lies anterior.

20

What are the cavities of the petrous part of the temporal bone? (3)

-Vestibule
-Semicircular canal
-Cochlea

21

Which part of the ear contains the cavities of the petrous part of the temporal bone?

The inner ear.

22

What do the cavities of the inner ear contain?

Perilymph.

23

What is the composition of perilymph?

Like extracellular fluid.
-high Na, low K

24

What is the cochlear duct?

A membranous sac running through the cochlea.

25

What does the cochlear duct contain?

Endolymph.

26

What is the composition of endolymph?

Like intracellular fluid.
-low Na, high K

27

What does the cochlea duct separate the cochlea into?

2 chambers;
-scala vestibule
-scala tympani

28

Which chamber is above the cochlear duct?

Scala vestibule.

29

Which chamber is below the cochlear duct?

Scala tympani.

30

Where are scala vestibule and scala tympani continuous?

Helicotrema.
-apex of the cochlea