Ear

Question 1

Answer 1

• A: Auricle (pinna)
• B: Helix
• C: Lobule

Question 2

Answer 2

• A: External ear
• B: Middle ear
• C: Internal ear (labyrinth)

Question 3

Answer 3

• A: External acoustic meatus
• B: Tympanic membrane
• C: Auditory (pharyngotympanic) tube

Question 4

What is the function of the pinna?

Answer 4

To collect sound

Question 5

On what bone is the external auditory meatus located?

Answer 5

Temporal bone

Lateral 1/3rd - waxy, cartilanginous

Medial 2/3rds - bony

Question 6

Answer 6

• A: Malleus (hammer)
• B: Incus (anvil)
• C: Stapes (stirrup)

Medial to lateral: MIS –> Malleus, incus, stapes

Question 7

What are the malleus, incus and stapes?

Answer 7

Ossicles (auditory ossicles)

• Their function is the transmission of acoustic energy from tympanic membrane to inner ear

Question 8

Answer 8

• A: Malleus
• B: Incus
• C: Stapes
• D: Cochlea
• E: Middle ear
• F: Eustachian tube

Question 9

Where does the eustachian tube go?

Answer 9

Connects middle ear with nasophrynx

Question 10

Answer 10

• A: Tensor tympani
• B: Stapedius

Question 11

Answer 11

• A: Internal auditory meatus

Question 12

Answer 12

• A: Squamous region
• B: External auditory meatus
• C: Zygomatic process
• D: Manidibular Fossa
• F: Styloid process
• G: Mastoid process

Question 13

Answer 13

• A: Mastoid portion
• B: Pertous portion (pyramid) (looks like mountain ridge)
• C: Internal auditory meatus

Question 14

What is the function of the inner ear?

Answer 14

Convert mechanical sound waves to neutral impulses for recognition by brain for:

• Hearing
• Balance

Question 15

Answer 15

• A: Auditory tube
• B: Round window
• C: Vestibule
• D: Cochlea

Question 16

Answer 16

• A: Inner ear
• B: Vestibulocochlear nerve
• C: Semicircular canals
• D: Oval window

Question 17

What is the bony and membranous labyrinth filled with?

Answer 17

• Bony: Perilymph
• Membranous: Endolymph

Question 18

Answer 18

• A: Tectorial membrane
• B: Cochlear duct
• C: Organ of Corti
• D: Basilar membrane

Question 19

Answer 19

1. Sound waves vibrate the tympanic membrane.
2. Auditory ossicles vibrate. Pressure is amplified.
3. Pressure waves created by the Stapes pushing on the oval window move through fluid in the scala vestibule
4. a) Sounds with frequencies below hearing travel through the helicotrema and do not excite hair cells

b) Sounds in the hearing range go through the cochlear duct, vibrating the basilar membrane and deflecting hairs on inner hair cells

Question 20

Answer 20

• A: Tectorial membrane
• B: Outer hair cell
• C: Inner hair cell
• D: Basilar membrane

Question 21

Answer 21

• A: Semicircular ducts (within canals)
• B: Utricle
• C: Saccule
• D: Macuale

Question 22

Answer 22

• A: Macula of utricle
• B: Macula of saccule