Ear and Auditory Tube Flashcards Preview

Hugh's MD1 Neuro > Ear and Auditory Tube > Flashcards

Flashcards in Ear and Auditory Tube Deck (24):
1

What innervates the sup. and post. aspect of the external acoutic meatus?

CNX

1

Which middle ear bone connects directly to the tympanic membrane?

Malleus

1

What are the muscles that act on the bones of the middle ear? Which nerve innervates them?

Stapedius (CNVII)

Tensor tympani (CNV)

2

What is the name of the glands in the ear that produce wax?

Cerumen

3

What are the names of the three ossicles?

Stapes

Incus

Malleus

4

What is important about the epitympanic recess?

It communicates to some areas of the mastoid therefore infections of the middle ear can spread there and be difficult to drain

4

What is the chorda tympani?

A branch of the facial nerve that travels through the middle ear. Innervates the salivary glands and tongue

4

What are the main features of the bone labyrinth?

Swirled cochlea and three semicircular canals connected by the vestibule

5

Which labyrinth contains perilymph?

The bony labyrinth

7

How does the tympanic membrane transmit sound?

It vibrates at the same freq and amplitude of the sound waves that impact upon it

9

What are the major parts of the auricle?

The helix

Tragus

Lobule

Ear Canal

10

What is the function of the auricle of the ear?

Collect sound and localise it

12

What is the function of the auditory tube?

Pressure equilisation between the middle ear and nasopharynx

13

What are the two windows in the middle ear?

Round window

Oval window

14

T/F the membranous labyrinth contains perilymph

False, it contains endolymph

15

What is the function of the ampulla in the inner ear?

They are fluid filled sacks with sensory receptors for dynamic equilibrium for the sensation of head movements

17

What nerve supplies the ant. and sup. wall of the external acoutic meatus? Why is it important?

Auriculotemporal nerve (a branch of the mandibular nerve of CNV)

Ear pain can be referred to the jaw

18

What is the function of the bones of the middle ear?

Vibrate to transmit sounds into the inner ear

19

How do the muscles of the middle ear dampen sound?

Tensing to prevent the ossicles from vibrating as much

20

What is the difference between the bony labyrinth and membranous labyrinth?

The bony labyrinth contains the membranous labyrinth inside it

21

Where is the inner ear located?

In a potential shape in the petrous part of the temporal bone

22

What are the bones of the middle ear called?

Ossicles

23

What is the cone of light of the tympanic membrane and why is it important?

The cone of light will appear if light is shined on the membrane. 

It will appear different if there is pressure behind the membrane

24

Which artery runs close to the middle ear and what is the implication of its presence?

Internal carotid artery

Throbbing when there is fluid in the middle ear