The Ear

Question 1

Answer 1

Question 2

What are the structures in the middle ear?

Answer 2

Tympanic membrane

Malleus

Incus

Stapes

Question 3

Answer 3

Question 4

What types of joints are found between the ossicles?

Answer 4

Synovial Joints

Question 5

Which ossicle is in contact with the tympanic membrane?

Answer 5

Malleus

Question 6

Which ossicle is in contact with the oval window?

Answer 6

Stapes

Question 7

Name two muscles related to the ossicle of the ear?

Answer 7

Stapedius muscle

Tensor tympani

Question 8

What are the actions of the ossicles?

Answer 8

Stapedius muscle- Tilts stapes backwards – dampens vibrations to control amplitude of sound waves

Tensor tympani- Pulls Malleus medially & tenses tympanic membrane dampening vibrations – Dampens the noise of chewing

Question 9

Name two areas with which the cavity of the middle ear communicates:

Answer 9

• Mastoid Air cells & Mastoid antrum*
• Nasopharynx*

Question 10

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

Answer 10

The petrous part of the temporal bone

Question 11

The inner ear consists of a series of bone lined chambers called what?

Answer 11

Bony labyrinth

Question 12

Inside the bony labyrinth lies a series of membranous chambers called what?

Answer 12

Membranous labyrinth

Question 13

What is the fluid that lies within the bony labyrinth?

Answer 13

Perilymph

Question 14

What is the fluid that lies within the membranous labyrinth?

Answer 14

Endolymph

Question 15

What is the function of the cochlea and the semicircular canals?

Answer 15

Cochlea is the auditory part of the inner ear

Semicircular canals are responsible for balance

Question 16

Answer 16

Question 17

Through which foramen does the facial nerve exit the posterior cranial fossa?

Answer 17

Internal auditory meatus

Question 18

Which other cranial nerve exits through this foramen?

Answer 18

Vestibulocochlear nerve

Question 19

The facial nerve runs where?

Answer 19

Runs in a canal (facial canal) on the medial wall of the middle ear cavity.

Question 20

What does the facial nerve leave the skull?

Answer 20

At the stylomastoid foramen

Question 21

What does the facial nerve give off while in the middle ear cavity?

Answer 21

The chora tympani nerve

Question 22

What do the parasympathetic facial fibres do?

Answer 22

Parasympathetic (preganglionic) efferent fibres destined for submandibular and sublingual salivary glands.

These are secretomotor.

Question 23

What are the sensory fibres of the facial nerve carrying?

Answer 23

Sensory fibres carrying the special sense of taste

Supplies the anterior 2/3rd of the tongue

Question 24

Answer 24