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The Eye Functions

Cornea-The cornea is a tissue that covers the eye. It is clear and dome shaped. The cornea helps focus light, and also lets light into the eye.Eyebrow-The eyebrow is a thick bit of hair above the eye and on the brow. It serves to keep liquid out of the eye, such as sweat and rain.Eyelash-The eyelash is located on the tips of the eyelids, on the tops and bottoms. It also serves to keep liquid, dust, and even small insects out of the eyes.Eyelid-The eyelid is a fold of skin that protects the eye from damage. It also has oils in it that help lubricate the eye, and the eyelid also keeps the eye lubricated during sleep.Iris-The coloured part of the eye. The iris controls how much light enters the eye by changing the size of the pupil. The iris makes the hole smaller in accordance with the amount of light; the more there is, the smaller it is.Lens-The lens gets smaller and larger depending on the amount of light, it helps focus light. People with eye defects can be myopic and hyper myopic, these are things that affect the eye, the former near sighted, and the latter far sighted.Optic Nerve-The optic nerve is the nerve that transmits impulses from the retina to the brain. It transmits these images backwards, but the brain flips it right side up.Pupil-The pupil is an opening in the centre of the iris, it will change size depending on the amount of light.Retina-The retina is one of the most important parts of the eye. It is the receptor that takes light rays and converts them into electrical impulses. These then get sent to the brain via the optic nerve.Tear-The tear is a clear liquid that is produced by glands in the eyes. It helps clean out the eyes.

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The Ear Functions
Outer EarThe outer ear is the visible part of the ear. It contains 3 parts, the Pinna, Auditory Canal and Ear Drum. These serve to transmit the sound waves to the middle ear.Pinna- The pinna is the part of the ear that amplifies and catches sound waves. The pinna then sends these to the auditory canalAuditory Canal- The auditory canal ispart of the ear that transmits these sounds to the eardrum, and starts the process of hearing.Eardrum- The eardrum vibrates when it is hit with sound waves, and subsequently starts the motion of vibration reactions that take hold in the middle ear.
Middle EarThe middle ear is the passage of travel for the vibrations from the outer ear to the inner ear. The middle ear consists of the hammer, stirrup, anvil and Eustachian Tube.Hammer- The hammer is one of the ossicles in the ear. There is 3 of these, and the hammer is the first. The hammer moves in a swinging motion when hit with vibrations, and moves the anvilAnvil- The anvil is another one of the ossicles in the ear. It also moves in the swinging motion, that was initiated by the ear drum, and started by the hammer.Stirrup- The stirrup is the final ossicle, but instead of just vibrating, it passes on the vibration started by the other parts of the ear before it, and passes it on to the oval window.Eustachian Tube- The eustachian tube is located at the bottom of the ear, and is responsible for releasing pressure in the ear.
Inner Ear- The inner ear regulates both hearing and balance, and contains some of the most important parts of the ear. The Oval window is just that, a window or passageway from the middle to inner ear, the semicircular canals maintain balance through the fluids in them that maintain balance, the cochlea performs the most important job in the brain, transforming the transferred vibrations into electrical impulses that the auditory nerve will take to the brain. Once this happens, the hearing process is complete.

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To see how some of this relates to real life, go to Real World Example Video!!!!!!!


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