Ear

Question 1

What is the function of the Pinna?

Answer 1

Receives sound waves and channels them into canal

Question 2

What is the function of the auditory canal?

Answer 2

Conducts sound waves from the outside to eardrum

Has ceremoniousl glands which secrete ear wax, that traps dust and protect ear drum

Question 3

What is the function of the tympanic membrane?

Answer 3

Converts sound waves into vibrations

Question 4

What is the middle ear?

Answer 4

An air filled cavity lined with mucous membrane

Question 5

What are the three membranes of Middle ear

Answer 5

Tympanic membrane
Oval window
Round window

Question 6

What is the function of the tympanic membrane?

Answer 6

Covers opening between middle and outer ear

Question 7

What is the function of the oval window?

Answer 7

Receives vibrations from stapes and transmits them to perilymph of inner ear

Question 8

What is the function of the round window?

Answer 8

Spreads away vibrations of the perilymph back into air of Middle ear.
Prevents sound waves continuing around

Question 9

What does the Middle ear consist of?

Answer 9

Tympanic membrane 
Oval window 
Round window
Ossicles:
- malleus
- incus
- stapes

Question 10

What is the structure of malleus?

Answer 10

Attached to tympanic membrane

Question 11

What is the structure of the incus?

Answer 11

Articulates with malleus and stapes

Question 12

What is the structure of the stapes?

Answer 12

Articulates with incus and is attached to the oval window

Question 13

What are the functions of the ossicles?

Answer 13

Transmit the vibrations across the middle ear from tympanic membrane to oval window

Question 14

How are the vibrations amplified?

Answer 14

Tympanic membranes are larger than oval window

Question 15

What is the function of the tiny muscles?

Answer 15

to protect inner ear from damage from loud noises

Question 16

Why is it important that Eustachian tube lead into pharynx?

Answer 16

Allows air to enter into the middle ear to equalise pressure on either side if the tympanic membrane, so can vibrate easily

Question 17

What are the 2 parts. The inner ear?

Answer 17

The vestibule for balance and lower cochlea for hearing

Question 18

What is the fluid, perilymph?

Answer 18

Fill tiny canals and cavities of the bone.

Question 19

What fluid is filled in the tiny tubes and acts of the perilymph?

Answer 19

Endolymph

Question 20

What are the three parts of the vestibule?

Answer 20

Sacculus
Utriculus
Semi-circular canals

Question 21

What are found in the sacculus and utriculus?

Answer 21

Patches of sensory cells -Maculae

Question 22

What is important about the otoliths, that embed the hairs of the cells?

Answer 22

When move head, Gravity pulls on otoliths,causes hairs to bend

Question 23

H do we know the position of our heads?

Answer 23

An impulses starts, passes along the equilibrium branch of auditory nerve into cerebellum of the brain.

Question 24

What is the name of the ‘swelling’ at the end of the semi-circular canal

Answer 24

Ampulla

Question 25

What are found in the Ampulla?

Answer 25

Patches of sensory cells - cristae

Question 26

What is important about the cupola?

Answer 26

When we move endolymph moves and bends these hairs and initiates an impulse . Tell us the movement of our head

Question 27

What are the 3 parts of the outer ear?

Answer 27

Pinna
Auditory canal
Tympanic membrane