Ear and Auditory Tube

Question 1

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

Answer 1

CNX

Question 1

Which middle ear bone connects directly to the tympanic membrane?

Answer 1

Malleus

Question 1

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

Answer 1

Stapedius (CNVII)

Tensor tympani (CNV)

Question 2

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

Answer 2

Cerumen

Question 3

What are the names of the three ossicles?

Answer 3

Stapes

Incus

Malleus

Question 4

What is important about the epitympanic recess?

Answer 4

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

Question 4

What is the chorda tympani?

Answer 4

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

Question 4

What are the main features of the bone labyrinth?

Answer 4

Swirled cochlea and three semicircular canals connected by the vestibule

Question 5

Which labyrinth contains perilymph?

Answer 5

The bony labyrinth

Question 7

How does the tympanic membrane transmit sound?

Answer 7

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

Question 9

What are the major parts of the auricle?

Answer 9

The helix

Tragus

Lobule

Ear Canal

Question 10

What is the function of the auricle of the ear?

Answer 10

Collect sound and localise it

Question 12

What is the function of the auditory tube?

Answer 12

Pressure equilisation between the middle ear and nasopharynx

Question 13

What are the two windows in the middle ear?

Answer 13

Round window

Oval window

Question 14

T/F the membranous labyrinth contains perilymph

Answer 14

False, it contains endolymph

Question 15

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

Answer 15

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

Question 17

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

Answer 17

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

Ear pain can be referred to the jaw

Question 18

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

Answer 18

Vibrate to transmit sounds into the inner ear

Question 19

How do the muscles of the middle ear dampen sound?

Answer 19

Tensing to prevent the ossicles from vibrating as much

Question 20

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

Answer 20

The bony labyrinth contains the membranous labyrinth inside it

Question 21

Where is the inner ear located?

Answer 21

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

Question 22

What are the bones of the middle ear called?

Answer 22

Ossicles

Question 23

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

Answer 23

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

It will appear different if there is pressure behind the membrane

Question 24

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

Answer 24

Internal carotid artery

Throbbing when there is fluid in the middle ear