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PARTS OF THE EAR
| Term | Definition |
|---|---|
| sound waves | vibrations that move through the air to our ears |
| outer ear | made up of the pinna, the ear canal, and the ear drum |
| pinna | visible portion of the ear that collects sound waves and funnels them through the ear canal |
| ear canal | a passageway that begins at the pinna and ends at the ear drum; it is lined by wax producing glands and fine hairs |
| ear wax | protects the eardrum by trapping dirt and foreign bodies |
| ear drum | a thin membrane that separates the outer ear and the middle ear; it vibrates as soon as it receives sound waves |
| middle ear | located between the outer ear and the inner ear; contains three tiny bones and the eustachian tube |
| middle ear cavity | an air filled space that contains three tiny bones |
| eustachian tube | a tube that connects the middle ear to the back of the throat, it equalizes air pressure in the middle ear and drains fluid from the middle ear to the back of the throat |
| ossicles | the three bones in the middle ear that vibrate in response to one another in order to send vibrations from the outer ear to the inner ear |
| hammer | a tiny bone located next to the eardrum; the vibrations from the eardrum cause it to vibrate |
| anvil | a tiny bone next to the hammer; it vibrates in response to the vibration of hammer |
| stirrup | it vibrates in response to the anvil and passes compression waves to the inner ear |
| oval window | an opening in the cochlea where the stirrup pushes through sending vibrations into the cochlea |
| inner ear | it is filled with a water-like substance and tiny hairs and makes up both the hearing and balancing organs |
| balance organs or semicircular canals | fluid-filled loops attached to the cochlea that help in maintaining the balance |
| cochlea | a spiral tube that has hair cells which respond to different frequencies of vibrations and then changes the vibrations into electrical impulses |
| hair cells | they change vibrations into electrical impulses which the brain interprets as sounds |
| hearing nerve | carries the electrical impulses generated in the cochlea to the brain where they are interpreted as sounds |
| temporal lobe | where the hearing center of the brain is located |
Created by:
DianneTysinger
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