lunes, 21 de enero de 2008

The Ear


http://www.health.state.ny.us/nysdoh/antibiotic/ear.gif

Parts of the Ear
Outer ear
The outer ear is called the pinna, which is the part outside the body and the ear canal. This part of the ear conducts sound waves into the ear. The complex folds, which form the outer ear not only, act as an amplifier, but also as a shield, to stop objects, such as insects, entering the ear.
Middle ear
Sound waves travel through the middle ear. On the outside edge of the middle ear is the eardrum. On the inside edge there is another drum which transmits the sound message to the brain along nerves. Between the two drums, there are three tiny bones, which help amplify the sound.
Inner ear
The inner ear is a delicate part of the ear, with fluid filled 'canals'. There is an inner ear on each side of the head, just next to the middle ear. They help the body with balance.
The snail like inner ear contains a maze of winding passages. This part of the ear deals with the reception and analysis of sound. It also keeps the body balanced.

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