Lab Ear (exam 4)

Question 1

What is the outer region of the ear called?

Answer 1

Pinna or auricle and auditory canal

Question 2

What is the middle region of the ear?

Answer 2

Auditory Ossicles (3 bones)

Question 3

What are the 3 auditory ossicles bones in order and there nicknames?

Answer 3

1) malleus- “hammer”- connected to ear drum
2) incus- “Anguil”- looks like a hammer
3) stapes- “stirrup”- connected to vestibule and part of inner ear

Question 4

What is the cavity of the middle ear called?

Answer 4

Tympanic cavity

Question 5

What is the tube that connects the middle ear to throat?

Answer 5

Auditory tube (Eustachian tube)

Question 6

What does the inner ear do and what does it have?

Answer 6

Defects sound, orientation and motion

Has hair cells

Question 7

What is a vestibular duct (Scala vestibuli)?

Answer 7

Transmits vibrations from oral window

Part of cochlea

Question 8

What is a tympanic duct (scala tympani)?

Answer 8

Brings vibrations to round window

Part of cochlea

Question 9

What is the cochlear duct (scala media)?

Answer 9

Surrounds organ of Corti

Part of cochlear

Question 10

What is the oval window?

Answer 10

Fenestea avalis

Goes with vestibular duct

Part of cochlea

Question 11

What is the round window?

Answer 11

Fenestra rotundrum

Goes with tympanic duct

Part of cochlea

Question 12

What is endolymph?

Answer 12

Liquid found in cochlear duct (scala media) and organ of corti

Found in cochlea

Question 13

What is perilymph?

Answer 13

Liquid inside vestibular and tympanic duct

Found in cochlear

Question 14

What is the organ or corti?

Answer 14

Detects sound

Where it crosses over depends on pitch

If crosses high near oval and round window there is a high pitch

The further away the lower the pitch

Part of cochlear

Question 15

What detects sound?

Answer 15

Cochlea- long structure rolled up to fit in skull

Question 16

What is the basilar membrane?

Answer 16

Holds the hair cells

Question 17

What is the tectorial membrane?

Answer 17

Overhanging shelf (above hairs)

Touched by hairs

Question 18

What are hair cells?

Answer 18

Cells with little hairs

Question 19

What is the auditory nerve and vestibulocochlear nerve?

Answer 19

Detects sound, orientation and motion

Yellow nerve in cochlear (part you have to open in ear model)

Blue thing on big board (not the vessel looking things)

Question 20

What is cochlear problem type of deafness?

Answer 20

Sensorineural

Question 21

What is ossicle bone problem type of deafness?

Answer 21

Conduction

Can be fixed

Question 22

What is the path of sound waves?

Answer 22

Vibration in atmosphere—-> vibration in tympanic membrane——> vibration in ossicle bones—-> oval window—-> perilymph of vestibular duct (scala vestibuli)—-> passes through cochlear duct (scala media) contains endolymph—-> stimulates organ of corti
END OF SOUND

vibration has to leave through tympanic duct (scala tympani) and discharge are round window

Question 23

What does the vestibule detect?

Answer 23

Orientation

Linear acceleration- going faster and faster in a straight line

Question 24

What is the main body of the inner ear?

Answer 24

Vestibule

Question 25

What are the 3 parts of the vestibule and explain each

Answer 25

1) maculae- hair cells inside structures
2) cupula- over hair cells (gelatin material)
3) otoliths- little stones in cupulas gelatin material

Question 26

What detects turning motion?

Answer 26

Semicircular canals

Question 27

What is the thickened part of the semicircular canal called?

Answer 27

Ampulla

Question 28

What is the pinna or auricle?

Answer 28

Ear you see

Question 29

What is the auditory canal called?

Answer 29

External auditory canal

Question 30

What produces ear wax?

Answer 30

Ceruminous glands

Question 31

What is the ear drum called?

Answer 31

Tympanic membrane