What do you hear?• Did you hear something? Maybe the

sound you heard was as quiet as your cat licking her paws. Or maybe it was loud, like a siren going by.

• Sounds are everywhere, and you have two cool parts on your body that let you hear them all: your ears!

• No matter where we go, sound waves are all around us.

Human ear• It has two

functions- one is hearing- maintaining the balance of the body or

equilibrium

Three parts the ear

1. Outer ear– collects sound waves and sends them to the middle ear. It is the visible

part of the ear.a. PINNA OR AURICLE - it is a flap of skin supported by the cartilage. It is a curved a part of the ear attached to the head, its shape makes it efficient in collecting and capturing sound waves - the soft tissue that hangs from the lower part of the auricle is the earlobe

1. Outer earb. EXTERNAL AUDITORY CANAL

- serves as passageway of sound waves into the ear. It is composed of glands which secrete

earwax. This waxy substance traps dust and other foreign bodies to prevent them from reaching the middle ear. The sound waves that pass through the auditory canal go to the eardrum

1. Outer earc. TYMPANIC MEMBRANE ( anterior eardrum)

- separates the outer ear from the middle ear at the end of the auditory canal that is very sensitive to sounds.

2. Middle ear- is a hollow air-filled cavity, consists of

the posterior and the three little bones: hammer, anvil, and stirrup.it is also situated in the middle ear the eustachian tube

2. Middle Eara.Tympanic membrane- causes the

eardrum to vibrate when sound come in through auditory canal. is is the vibration that sends sound waves deeper into the ear.

2. Middle Earb.The three tiniest bones of the body

a. Hammer- attached to the eardrumb. anvil – connects the hammer to the stirrupc. stirrup – connected to the oval window

3. Inner ear

– consists of the cochlea and the semicircular canals , located in the skull

3. Inner ear a. Cochlea – a tube shaped like a shell of a snail which

consists of coiled, liquid-filled tubes that are separated from one another by membranes. Lining of the membranes are specialized hair cells that are sensitive to vibration. It contains actual organ of hearing called organ of corti. That receives the sound waves and transmit them to the brain

3. Inner ear b. semi-circular canal – enable the body to

maintain balance, consists of three interconnected loop-shaped tubes at right angles to one another, these canals contain fluid and hairlike projections that detect changes in body positions

3. Inner ear c. Auditory nerve – responsible in sending message to the brain

How does the ear work?

Sound Waves

Sound waves are sent. The outer ear “catches the sound waves”. The middle ear takes the sound waves and

“vibrates” the eardrum. The inner ear sends the messages to the

brain.Middle Ear

Inner Ear

The brain puts it together and hooray! You hear your favorite song on the radio.

Outer Ear

Common Ailments 1. EAR INFECTIONS – (middle or outer ear )

Symptoms high fever, abscess, and loss of hearing. A milky discharge with unpleasant odor comes out of the ear, sever pain in the ear.

Common Ailments2. EAR BOIL – an infection on the outer

ear characterized by infection and swelling , caused by impacted teeth, ear wax, sinusitis, or prolonged exposure to loud noise.

Common Ailments 3. DEAFNESS – loss of hearing

- it is the result of an injury in the inner ear. When the eardrum breaks , the person may become partially or totally deaf.

OTOLARYNGONOLOGISTS – a trained doctors who treat diseases of ear 9inflammation, infection, or allergic condition)

Proper Care for the ears 1. Clean your outer ear with a clean washcloth.2. Do not use your fingers, hairpins, or

toothpicks in removing earwax,3. Never put any pointed object like a pencil or

ballpen into your ear.

Proper care for the ears4. Do not allow anybody to shout into your ear.

Strong force of the air that may enter your ear can press too hard on your eardrum and break it.

5. Turn down the volume of appliances.6. Avoid blows and bumps on your head, especially

near the ear, these can injure eardrum.

Proper Care for the ears 7. Do not blow your nose too hard. This can cause

germs from your throat to go up the Eustachian tube to your ears.

8. When swimming or diving , protect the eardrums by wearing a cap or using earplugs.

9. Any ear problem should be consulted to a doctor

Helen Keller Story People who have lost one or more of their

senses can succeed in life. Perhaps the most famous case of a physically challenged person who succeeded is that of Helen Keller who was born normal child in 1880.

Helen Keller Before she was two, an illness deprived her

of her sight and hearing. Ann Sullivan , a special teacher , created a bond between Helen and the world through the little girl’s sense of touch . Helen could “hear “ Ann by placing her hand over her teacher’s lips.

Helen Keller She earned a college degree, became a

writer, and was honored by famous people such as Alexander Graham Bell and Eleanor Roosevelt . She toured the world , giving hope to deaf and blind people.