Hearing

Question 1

Structure of ear

Answer 1

1.Outer ear
2.Middle ear
3.Inner ear

Question 2

Structure of outer ear

Answer 2

Pinna(auricle)
Auditory canal or tympanic canal
Tympanic membrane(eardrum)

Question 3

Func of tympanic canal

Answer 3

To collect sound waves & channel them to the tympanic membrane

Question 4

Func of Tympanic membrane

Answer 4

A thin tissue that separate the outer ear from middle ear

Question 5

Outer ear and middle ear are separated by

Answer 5

Tympanic membrane

Question 6

Structure of middle

Answer 6

Stapes
Incus
Malleus
Opening of eustachian tube

Question 7

Middle ear is open into

Answer 7

Eustachian tube

Question 8

Eustachian tube is made up of

Answer 8

Elastic cartilage

Question 9

Eustachian tube connect

Answer 9

Middle ear to the pharynx

Question 10

Func of eustachain tube

Answer 10

To balance the pressure inside the middle ear with the atmospheric pressure

Question 11

Structure of inner ear

Answer 11

3 Semicircular canals
Cochlea

Question 12

Chambers of inner ear are filled with

Answer 12

Two types of fluids
1.perilymph
2.endolymph

Question 13

Inside the cochela contain

Answer 13

2 large canals
1.Upper vestibular canal
2.Lower tympanic canal

At the end of cochela,the vestibular canal and tympanic canal are connected

Question 14

Upper and lower canal of cochela are separated by

Answer 14

smaller cochlear duct

Question 15

Both upper and lower canal of cochela are filled with

Answer 15

Perilymph fluids

Question 16

Basailar membrane of cochlear duct contain

Answer 16

Organ of Corti

Question 17

Organ of corti is made up of

Answer 17

Hair cells (cells with hair projecting into the cochlear duct)

Question 18

Tectorial membrane

Answer 18

a gelatinous, acellular membrane located above the hair cells of Organ of Corti

Question 19

Hair cells are attached to

Answer 19

Tectorial membrane

Question 20

Func of hair cell

Answer 20

Serve as machanoreceptor of the ear

Question 21

Organ of Corti contain

Answer 21

Mechanoreceptor of the ear (hair cells)

Question 22

How ear function?

Answer 22

1.By first collecting sound waves in the outer ear, which funnel into the ear canal to vibrate the eardrum
2.These vibrations then move through three tiny bones in the middle ear (the ossicles), amplifying the sound.
3.The vibrations then enter the snail-shaped cochlea in the inner ear, where they are converted into electrical impulses by hair cells.
4.These impulses travel along the auditory nerve to the brain, which interprets them as sound.

Question 23

What will happen when sound waves enter the cochlea?

Answer 23

Sound waves make the vibration of basilar membrane of cochlear duct which result in bending of hair cells and depolarization of hair cells in the cochlea

Question 24

The obj vibrating inside the atm produce _____.

Answer 24

Pressure waves

Question 25

Pressure waves are collected by _____ and travel along the_____.

Answer 25

Auricle of outer ear and travel along the auditory canal

Question 26

The sound waves entering the auditory canal reach the ______ and cause vibration.

Answer 26

Eardrum (tympanic canal)

Question 27

The vibration of eardrum cause

Answer 27

The vibration of stapes,malleus,incus of the middle ear

Question 28

Func of melleus,stapes and incus

Answer 28

To amplify the sound waves (increase vibration)

Question 29

why sound waves need to amplify in middle ear?

Answer 29

Air vs. Fluid: The middle ear acts as a transformer, converting the low-pressure sound waves in the air to higher-pressure vibrations in the inner ear fluid, effectively matching the impedances of the two different media.

Question 30

Stapes connect to

Answer 30

Oval window which in turn connect to the cochlea of inner ear

Question 31

Oval window connects

Answer 31

Stapes of middle ear Cochlea of inner ear

Question 32

At the end of cochela,the vestibular canal and tympanic canal are connected.True or False?

Answer 32

True The connecting point is called helicotrema

Question 33

How sound wave dissipate in ear?

Answer 33

After propangating throught the vestibular canal,sound waves pass around the tip(apex) of the cochlea and travel along the tympanic canal and dissipate as the strike the round window (no echo)

Question 34

Round window located at

Answer 34

the base of oval window

Question 35

Openings of middle ear into inner ear

Answer 35

Upper oval window Lower round window

Question 36

Overview of hearing in inner ear

Answer 36

Sound>Vibration of the basilar membrane>Hair cells become raised and lowered>Bending of hair against surrounding fluid and tectorial membrane>Mechanoreceptor activated>changing of membrane potential of the hair cell

Question 37

Func of ear

Answer 37

Hearing Balancing equilibrium

Question 38

Parts involved in maintaining equilibrium in ear

Answer 38

Semicircular canal Vestibules

Question 39

Vestibules contains

Answer 39

Utricle Saccule

Question 40

Vestibule

Answer 40

an oval, bony cavity in the inner ear, connecting the cochlea (for hearing) and the semicircular canals (for balance)

Question 41

Utricle and saccule detect

Answer 41

Linear acceleration and head position relative to gravity (detected by hair cells)

Question 42

Utricle and saccule contain

Answer 42

Specilized hair cells that embedded into gelatinous material

Question 43

Hair cells of utricle and saccule are porject into

Answer 43

Otolithic membrane (Geletinous membrane)

Question 44

Embedded in otolithic membrane are

Answer 44

Calcium carbonate crystal called Otoconia or otoliths

Question 45

Structure of semicircular canal

Answer 45

three interconnected, ring-like tubes within the inner ear, each oriented in a different plane (horizontal, vertical sagittal, and vertical frontal)

Question 46

Semicircular canals detect

Answer 46

Rotational (angular) acceleration & turning of the head

Question 47

Each semicircular canal contain

Answer 47

Ampulla (which contain hair cells)

Question 48

Ampulla of semicircular canal contain

Answer 48

Hair cells

Question 49

Hair cells of ampulla projects into

Answer 49

Geletinous cap called cupula

Question 50

Nerve impulses from the ear travel to the brain via

Answer 50

Cochlear nerve (auditory nerve) Vestibular nerve (equilibrium nerve)

Question 51

Vestibulocochlear nerve

Answer 51

Cranial nerve VIII A single nerve that brances into auditory nerve(for hearing) & vestibular nerve(for balance)

Question 52

Vestibular system

Answer 52

The system that maintains the balance inside the inner ear 1.Semicircular canals 2.Utricle 3.Saccule