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Hearing is one of the five human senses. Hearing is one of the five human senses.

Hearing is one of the five human senses. - PowerPoint Presentation

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Hearing is one of the five human senses. - PPT Presentation

Hearing S ight Smell Taste T ouch How We Hear We use our ears to hear sounds Sounds travel through the air and our ears as sound waves How We Hear Sound waves are collected by the outer part of the ear called the ID: 514431

ear hearing noise hear hearing ear hear noise loud hair cochlea cells waves ears sound audiologist vibrate cilia 1986

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Slide1
Slide2

Hearing is one of the five human senses.

Hearing

|

S

ight

|

Smell

|

Taste

|

T

ouchSlide3

How We Hear

We use our ears to hear sounds.

Sounds travel through the air and our ears as sound waves.Slide4

How We Hear

Sound waves are collected by the outer part of the ear, called the

pinna

.

The pinna is the only part of the ear that you can see with your eye.Slide5

How We Hear

After the sound waves are collected by the pinna they are sent through the ear canal before reaching the ear drum.

When the sound waves hit the ear drum, it vibrates.Slide6

How We Hear

The vibrations from the ear drum make three small bones in the ear vibrate.

The hammer

The anvil

The stirrup

Those three bones together are called the ossicles.

hammer

anvil

stirrupSlide7

How We Hear

The vibration of the ossicles transfer the sound waves to the inner ear.

The inner ear has two parts, the cochlea and the semicircular canals.

The semicircular canals. help you determine movement and to stay balanced.

semicircular canals

cochleaSlide8

How We Hear

As the sound waves pass through the cochlea, they cause microscopic hair cells to vibrate.

These hair cells, called cilia, are linked to the auditory nerve. When the cilia vibrate they send an electric impulse signal to the brain.

When the signal reaches the brain, we hear!

From David J. Lim. Functional Structure of the Organ of Corti: A Review. Hearing Research, 22 (1986) 117-146

cochlea

auditory nerve

CiliaSlide9

How We Hear

As the sound waves pass through the cochlea, they cause microscopic hair cells to vibrate.

These hair cells, called cilia, are linked to the auditory nerve. When the cilia vibrate they send an electric impulse signal to our brain.

When the signal reaches the brain, we hear!

From David J. Lim. Functional Structure of the Organ of Corti: A Review. Hearing Research, 22 (1986) 117-146

cochlea

auditory nerve

CiliaSlide10

Now imagine not being able to hear your friends and parents talk.

That

s Hearing Loss!Slide11

When we are exposed to noises that are too loud, our tiny hair cells in the cochlea vibrate too hard.

The vibrations cause them to break and bend.

From David J. Lim. Functional Structure of the Organ of Corti: A Review. Hearing Research, 22 (1986) 117-146 Elsevier

NIHL (Noise-Induced Hearing Loss)

Hearing loss as a result of prolonged or sudden exposure to loud noise.

Slide12

NIHL

Once our microscopic hair cells bend and break, they will never be straight again.

There is no surgery to fix the hair cells, once they are damaged they will never work properly again. 

To treat NIHL visit an audiologist.

From David J. Lim. Functional Structure of the Organ of Corti: A Review. Hearing Research, 22 (1986) 117-146 ElsevierSlide13

An audiologist is the person you visit to

have your ears checked.

He or she will look inside your ears to make sure everything looks alright

He or she will do a hearing test to make sure you are hearing everything alright.

If the audiologist finds that you have hearing loss, he or she will

work with you to select and fit hearing aids so you can hear again.

AudiologistSlide14

30 dB Whisper

60 dB Normal conversation or a dishwasher

70 dB A vacuum Cleaner

80 dB Alarm Clock

90 dB A hair dryer, or lawn mower

100 dB

MP3 players at full volume

110 dB Concerts and sporting events

130 dB Ambulance

Noise levels or loudness are measured in decibels (dB).

Any loud noise over 85dB is considered loud enough to cause NIHL.

Slide15

Levels of Noise chart.Slide16

3 Ways to Protect

Your HearingSlide17

Walk Away

If the noise around you is too loud, walk away.

Moving back 10 or 15 feet from the noise can make the noise going into your ears less loud.

If you are in a noisy place, make sure you only stay for 30 minutes, if you are not wearing any ear protection.Slide18

Turn It Down

When TVs, car stereos, and MP3 players are turned up too loud, the noise can hurt your ears.

Turn down the volume to protect your ears.

Keep the volume at 50%.

When listening to anything with ear buds or ear phones, if someone next to you can hear what you are hearing,

the volume is probably too loud

.Slide19

Wear Ear Protection

If you know you are going to be in a loud area with noise over 85 dB, wear ear protection.

Earplugs

Custom (made to fit your ear) earplugs

See an audiologist for these, similar to what musicians and pilots wear.Slide20

If you think you or someone

you know might have a hearing problem?

Tell your parents to go online to

www.HowsYourHearing.orgto find an audiologist near you.

Questions???