Week 3: Station 3 - The Ear

Question 1

Answer 1

1. Pinna
2. Incus
3. Malleus
4. Tympanic membrane
5. Stapes
6. Semicircular canals
7. Cochlea
8. Vestibulocochlear nerve
9. Round window
10. Tympanic cavity
11. Eustacian tube
12. Ear canal

Question 2

What type of joints are found between the ossicles?

Answer 2

Synovial

Question 3

Name two muscles related to the ossicles and their nerve supply?

Answer 3

Tensor tympani (V3)

Stapedius (VII)

Question 4

What is the action of the tensor tympani?

Answer 4

• Pull the handle of the malleus to tense the eardrum for a loud noise

Question 5

What is the function of the stapedius?

Answer 5

Pulls stapes causing it to tilt in it’s base

Lowers oscillatory range

Question 6

Which two areas does the middle ear communicate with?

Answer 6

Mastoid antrum

Nasopharynx

Question 7

In which part of the temporal bone do the middle and inner ear lie?

Answer 7

Petrous part

Question 8

What is the name given to the series of bone lined chambers in the inner ear?

Answer 8

The bony labyrinth

Question 9

Inside the bony labrynth there are a series of membranous chambers called the

Answer 9

Membraneous labyrinth

Question 10

What is the name of the fluid inside the bony labyrinth?

Answer 10

Perilymph

Question 11

What is the name of the fluid inside the membranous labyrinth?

Answer 11

Endolymph

Question 12

Through which foramen does the facial nerve exit the skull and where is it located?

Answer 12

Internal acoustic meatus

Posterior cranial fossa

Question 13

What other cranial nerve exits through the internal acoustic meatus?

Answer 13

Vestibulocochlear